1. subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. 2. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. 3. previous vaccination with an investigational covid-19 vaccine. 4. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. 5. history or present of thrombocytopenia and/or bleeding disorders. 6. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. 7. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. 8. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. 9. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. 10. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. 11. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. 12. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). 13. received measles-containing vaccine within 3 months prior to enrollment. 14. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. 15. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. 16. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. 17. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. 18. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . 19. subjects with confirmed or suspected immunodeficiency. 20. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. 21. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. 22. history of confirmed sars-cov or mers-cov infection. 23. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. 24. current or history of alcohol or drug abuse during the previous 3 years. 25. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.

1. subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. 2. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. 3. previous vaccination with an investigational covid-19 vaccine. 4. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. 5. history or present of thrombocytopenia and/or bleeding disorders. 6. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. 7. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. 8. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. 9. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. 10. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. 11. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. 12. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). 13. received measles-containing vaccine within 3 months prior to enrollment. 14. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. 15. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. 16. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. 17. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. 18. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . 19. subjects with confirmed or suspected immunodeficiency. 20. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. 21. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. 22. history of confirmed sars-cov or mers-cov infection. 23. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. 24. current or history of alcohol or drug abuse during the previous 3 years. 25. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.

subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. previous vaccination with an investigational covid-19 vaccine. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. history or present of thrombocytopenia and/or bleeding disorders. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). received measles-containing vaccine within 3 months prior to enrollment. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . subjects with confirmed or suspected immunodeficiency. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. history of confirmed sars-cov or mers-cov infection. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. current or history of alcohol or drug abuse during the previous 3 years. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.

subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. previous vaccination with an investigational covid-19 vaccine. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. history or present of thrombocytopenia and/or bleeding disorders. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). received measles-containing vaccine within 3 months prior to enrollment. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . subjects with confirmed or suspected immunodeficiency. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. history of confirmed sars-cov or mers-cov infection. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. current or history of alcohol or drug abuse during the previous 3 years. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.

1. subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. 2. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. 3. previous vaccination with an investigational covid-19 vaccine. 4. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. 5. history or present of thrombocytopenia and/or bleeding disorders. 6. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. 7. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. 8. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. 9. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. 10. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. 11. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. 12. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). 13. received measles-containing vaccine within 3 months prior to enrollment. 14. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. 15. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. 16. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. 17. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. 18. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . 19. subjects with confirmed or suspected immunodeficiency. 20. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. 21. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. 22. history of confirmed sars-cov or mers-cov infection. 23. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. 24. current or history of alcohol or drug abuse during the previous 3 years. 25. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.

1. subjects actively or previously infected by sars-cov-2, as determined by a positive rt-pcr and positive serology test. 2. subject currently working with high risk of exposure to sars-cov-2 (e.g. health care worker, emergency response personnel, etc.) or considered at the investigator's discretion to be at increased risk to acquire sars-cov-2 for any other reason. 3. previous vaccination with an investigational covid-19 vaccine. 4. history of presence of pulmonary disorders (e.g. copd, etc.) or asthma. 5. history or present of thrombocytopenia and/or bleeding disorders. 6. a positive serum pregnancy test at screening or urine pregnancy test prior to study injection, women who are planning to become pregnant during the study, or women who are breastfeeding. 7. clinically relevant history of or current renal, hepatic, gastrointestinal, cardiovascular, respiratory, skin, hematological, endocrine, inflammatory, autoimmune, central nervous system or neurological diseases or clinically relevant abnormal laboratory values. 8. use of immunosuppressive drugs like e.g. corticosteroids (excluding topical preparations and inhalers) within 3 months prior to the first vaccination or 6 months for chemotherapies and all along the study. 9. a diagnosis of schizophrenia, bipolar disease, or history of hospitalization for a psychiatric condition or previous suicide attempt. 10. a history of treatment for any other psychiatric disorder in the past 3 years that increases the risk to the subject in the opinion of the investigator. 11. received immunoglobulin or other blood product within 3 months prior to enrollment or planned receipt of immunoglobulin or a blood product through study completion. 12. vaccination within 4 weeks prior to first injection or planning to receive a licensed vaccine before d56 (e.g. inactivated influenza vaccine). 13. received measles-containing vaccine within 3 months prior to enrollment. 14. history of severe adverse reactions to vaccine administration, including anaphylaxis and related symptoms, such as urticaria, respiratory difficulty, angioedema and abdominal pain to vaccines, or history of known or suspected allergic reaction likely to be exacerbated by any component of the covid-19 vaccine. 15. participation in another investigational clinical study within four weeks before the screening visit or planned before the study completion. 16. individuals who are living and/or working with severely immunocompromised people, pregnant women, lactating women, children under 12 months old, or any other individual that, in the judgment of the investigator, might be at increased risk. 17. any condition that, in the opinion of the investigator, may interfere with the aim of the study or the safety or wellbeing of the subject. 18. subjects with any condition associated with, or that might be associated with, an increased risk of severe illness from covid-19 according to us cdc definition . 19. subjects with confirmed or suspected immunodeficiency. 20. exposure to an individual with confirmed covid-19 or sars-cov-2 infection within the past 2 weeks prior to enrollment. 21. subject with an acute disease and/or fever (body temperature ≥ 38°c) at the time of the 1st vaccination visit. 22. history of confirmed sars-cov or mers-cov infection. 23. current heavy smoker defined as smoking at least 20 cigarettes (1 pack, or equivalent) per day or former heavy smoker who was an active heavy smoker within the last year prior to the screening visit or has a total smoking history of ≥ 1 pack per day for 10 years or more. 24. current or history of alcohol or drug abuse during the previous 3 years. 25. presence of tattoos that, in the opinion of the investigator, would preclude evaluation of the injection site.