subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: 1. clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; 2. any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); 3. acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); 4. prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); 5. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; 6. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis \[i.e. a small number of minor plaques requiring no systemic treatment\], etc.); 7. administration of any medication or treatment that may alter the vaccine immune responses, such as: * systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; * cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); * any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); 8. administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 9. administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; 10. known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; 11. subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); 12. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; 13. have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; 14. use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: * medications listed among the methods of contraception in inclusion criterion 7; * subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. 15. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); 16. use of prophylactic medications (e.g. antihistamines \[h1 receptor antagonists\], nonsteroidal anti-inflammatory drugs \[nsaids\], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 17. history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; 18. history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); 19. currently smoke more than 10 cigarettes per month or any use of vaping products; 20. subjects with a history of guillain-barré syndrome; 21. any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; 22. subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.

subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: 1. clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; 2. any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); 3. acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); 4. prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); 5. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; 6. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis \[i.e. a small number of minor plaques requiring no systemic treatment\], etc.); 7. administration of any medication or treatment that may alter the vaccine immune responses, such as: * systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; * cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); * any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); 8. administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 9. administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; 10. known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; 11. subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); 12. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; 13. have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; 14. use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: * medications listed among the methods of contraception in inclusion criterion 7; * subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. 15. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); 16. use of prophylactic medications (e.g. antihistamines \[h1 receptor antagonists\], nonsteroidal anti-inflammatory drugs \[nsaids\], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 17. history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; 18. history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); 19. currently smoke more than 10 cigarettes per month or any use of vaping products; 20. subjects with a history of guillain-barré syndrome; 21. any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; 22. subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.

subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis [i.e. a small number of minor plaques requiring no systemic treatment], etc.); administration of any medication or treatment that may alter the vaccine immune responses, such as: systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: medications listed among the methods of contraception in inclusion criterion 7; subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); use of prophylactic medications (e.g. antihistamines [h1 receptor antagonists], nonsteroidal anti-inflammatory drugs [nsaids], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); currently smoke more than 10 cigarettes per month or any use of vaping products; subjects with a history of guillain-barré syndrome; any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.

subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis [i.e. a small number of minor plaques requiring no systemic treatment], etc.); administration of any medication or treatment that may alter the vaccine immune responses, such as: systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: medications listed among the methods of contraception in inclusion criterion 7; subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); use of prophylactic medications (e.g. antihistamines [h1 receptor antagonists], nonsteroidal anti-inflammatory drugs [nsaids], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); currently smoke more than 10 cigarettes per month or any use of vaping products; subjects with a history of guillain-barré syndrome; any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.

subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: 1. clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; 2. any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); 3. acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); 4. prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); 5. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; 6. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis [i.e. a small number of minor plaques requiring no systemic treatment], etc.); 7. administration of any medication or treatment that may alter the vaccine immune responses, such as: - systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; - cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); - any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); 8. administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 9. administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; 10. known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; 11. subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); 12. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; 13. have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; 14. use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: - medications listed among the methods of contraception in inclusion criterion 7; - subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. 15. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); 16. use of prophylactic medications (e.g. antihistamines [h1 receptor antagonists], nonsteroidal anti-inflammatory drugs [nsaids], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 17. history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; 18. history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); 19. currently smoke more than 10 cigarettes per month or any use of vaping products; 20. subjects with a history of guillain-barré syndrome; 21. any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; 22. subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.

subjects who meet any of the following criteria at the screening (visit 1) and/or vaccination (visit 2) visits will not be eligible for participation in this study; no protocol waivers are allowed. all investigator assessment-based judgements must be thoroughly documented in the source documents: 1. clinically significant acute or chronic pulmonary (including but not limited to chronic obstructive pulmonary disease or asthma), cardiovascular (including but not limited to arterial hypertension, coronary artery disease, or congestive heart failure), renal, metabolic (including but not limited to type 2 diabetes), or other somatic (medical) or neuropsychiatric illness within 3 months prior to screening (visit 1), excessive alcohol use or drug abuse, as determined by medical history, physical examination, vital signs, and clinical laboratory tests. investigator discretion is permitted with this exclusion criterion and must be carefully and fully documented in the source documents; 2. any unexplained clinical syndrome (including, but not limited to, chronic fatigue syndrome, raynaud's syndrome, unexplained pain syndromes such as fibromyalgia, etc.); 3. acute disease defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to vaccination (visit 2); 4. prior exposure to sars-cov-2 as determined by detection of igm or igg antibodies against sars-cov-2 at screening (visit 1) and vaccination (visit 2); 5. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, human immunodeficiency virus (hiv), hepatitis b or c infection (subjects with a history of cured hepatitis b or c infection without any signs of immunodeficiency at present time are allowed). investigator discretion is permitted with this exclusion criterion; 6. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion, and subjects may be eligible to participate with appropriate written justification in the source document (i.e. subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, or on stable thyroid replacement therapy, mild psoriasis [i.e. a small number of minor plaques requiring no systemic treatment], etc.); 7. administration of any medication or treatment that may alter the vaccine immune responses, such as: - systemic glucocorticoids within one month prior to vaccination (visit 2). inhaled, nasal, dermal, intraarticular, ophthalmic and other topical glucocorticoids are permitted; - cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to vaccination (visit 2); - any immunoglobulin preparations or blood products, blood transfusion - within 6 months prior to vaccination (visit 2); 8. administration of any vaccine within 30 days prior to vaccination (visit 2); planned administration of any vaccine during the study (up to blood sampling on day 42 of the study). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 9. administration of any other sars-cov-2 / covid-19, or other experimental coronavirus vaccine at any time prior to or during the study; 10. known current or previous laboratory-confirmed sars-cov-1 or sars-cov-2 / covid 19 infection as documented by a positive pcr test or positive serological test; 11. subjects at high risk of contracting sars-cov-2/covid-19 infection, including but not limited to the individuals with known close contact of anyone with laboratory-confirmed sars-cov-2 / covid-19 infection within 2 weeks prior to vaccine administration, those who traveled outside canada for any duration within 30 days before the study vaccination, healthcare workers in acute care hospitals, rehabilitation hospitals, mental health hospitals, long term care facilities, emergency departments, and others who through their work must come into close face-to-face contact with their clients or patients (including, but not limited to, physiotherapists, dentists, hair dressers/barbers, etc.); 12. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to vaccination (visit 2) or planned use during the study period; 13. have a rash, dermatological condition, tattoos, muscle mass, or any other abnormalities at injection site that may interfere with injection site reaction rating. investigator discretion will be permitted with this exclusion criterion; 14. use of any prescription medication on a regular basis for more than 30 continuous days within the last 3 months, with the following exceptions: - medications listed among the methods of contraception in inclusion criterion 7; - subjects on stable thyroid replacement therapy, as noted in exclusion criterion 6. 15. use of any prescription antiviral drugs with the intention of covid-19 prophylaxis, including those that are thought to be effective for prevention of covid-19 but have not been licensed for this indication, within one month prior to vaccination (visit 2); 16. use of prophylactic medications (e.g. antihistamines [h1 receptor antagonists], nonsteroidal anti-inflammatory drugs [nsaids], systemic and topical glucocorticoids, non-opioid and opioid analgesics) within 24 hours prior to the vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 17. history of allergy to any of the constituents of the coronavirus-like particle covid-19 vaccine, vaccine adjuvants, or tobacco; 18. history of anaphylactic allergic reactions to plants or plant components (including fruits and nuts); 19. currently smoke more than 10 cigarettes per month or any use of vaping products; 20. subjects with a history of guillain-barré syndrome; 21. any female subject who has a positive or doubtful pregnancy test result prior to vaccination or who is lactating; 22. subjects identified as an investigator or employee of the investigator or clinical site with direct involvement in the proposed study, or identified as an immediate family member (i.e. parent, spouse, natural or adopted child) of the investigator or employee with direct involvement in the proposed study, or any employees of medicago.