* subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: 1. according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: * requiring a new medical or surgical treatment during the three months prior to study vaccine administration; * requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: * systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; * cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); * any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.

* subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: 1. according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: * requiring a new medical or surgical treatment during the three months prior to study vaccine administration; * requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: * systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; * cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); * any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.

subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: requiring a new medical or surgical treatment during the three months prior to study vaccine administration; requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.

subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: requiring a new medical or surgical treatment during the three months prior to study vaccine administration; requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.

- subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: 1. according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: - requiring a new medical or surgical treatment during the three months prior to study vaccine administration; - requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: - systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; - cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); - any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.

- subjects who meet any of the following exclusion criteria at the screening visit (visit 1) and/or 1st vaccination visit (visit 2) will not be eligible for participation in this study. all investigator assessment-based judgments must be carefully and fully documented in the source documents: 1. according to the investigator's opinion, significant acute or chronic, uncontrolled medical or neuropsychiatric illness. acute disease is defined as presence of any moderate or severe acute illness with or without a fever within 48 hours prior to the screening visit (visit 1) and/or 1st vaccination visit (visit 2). 'uncontrolled' is defined as: - requiring a new medical or surgical treatment during the three months prior to study vaccine administration; - requiring any significant change in a chronic medication (i.e. drug, dose, frequency) during the three months prior to study vaccine administration due to uncontrolled symptoms or drug toxicity unless the innocuous nature of the medication change meets the criteria outlined in inclusion criterion no. 8 and is appropriately justified by the investigator. investigator discretion is permitted with this exclusion criterion. 2. any confirmed or suspected current immunosuppressive condition or immunodeficiency, including cancer, 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; 3. current autoimmune disease (such as rheumatoid arthritis, systemic lupus erythematosus or multiple sclerosis). investigator discretion is permitted with this exclusion criterion. subjects may be eligible to participate with appropriate written justification in the source document. for example, subjects with a history of autoimmune disease who are disease-free without treatment for three years or more, subjects receiving stable thyroid replacement therapy, and subjects with mild psoriasis (i.e. a small number of minor plaques requiring no systemic treatment) are eligible for participation; 4. administration of any medication or treatment that may alter the vaccine immune responses, such as: - systemic glucocorticoids at a dose exceeding 10 mg of prednisone (or equivalent) per day for more than seven consecutive days or for 10 or more days in total, within one month prior to the 1st vaccination visit (visit 2). inhaled, nasal, ophthalmic, dermatological, and other topical glucocorticoids are permitted; - cytotoxic, antineoplastic, or immunosuppressant drugs - within 36 months prior to 1st vaccination visit (visit 2); - any immunoglobulin preparations, blood products, or blood transfusion - within 6 months prior to 1st vaccination visit (visit 2); 5. administration of any vaccine within 14 days prior to 1st vaccination visit (visit 2); planned administration of any vaccine during the study (up to day 28). immunization on an emergency basis during the study will be evaluated on case-by-case basis by the investigator; 6. administration of any other sars-cov-2/covid-19 vaccine, or other experimental coronavirus vaccine at any time prior to or during the study; 7. at screening (visit 1), subjects found to be seropositive for prior sars-cov-2 infection based on n-protein elisa or positive for sars-cov-2 pcr test; 8. subjects with previous diagnosis of covid-19 or previous positive sars-cov-2 infection 9. use of any investigational or non-registered product within 30 days or 5 half-lives, whichever is longer, prior to 1st vaccination visit (visit 2), or planned use during the study period. subjects who are in a prolonged post-administration observation period of another investigational or marketed drug clinical study, for which there is no ongoing exposure to the investigational or marketed product and all scheduled on-site visits are completed, will be allowed to take part in this study, if all other eligibility criteria are met; 10. 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 is permitted with this exclusion criterion: 11. 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 1st vaccination visit (visit 2); 12. 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 1st vaccination (visit 2) to prevent or pre-empt symptoms due to vaccination; 13. history of a serious allergic response to any of the constituents of mt-2766; 14. history of a documented anaphylactic reactions to plants or plant components (including tobacco, fruits, and nuts); 15. personal or family (first-degree relatives) history of narcolepsy; 16. subjects with a history of guillain-barré syndrome; 17. any female subject who has a definitely or possibly positive pregnancy test result prior to vaccination or who is lactating; 18. as a result of the medical screening process, the investigator considers the subject not suitable for the study.