1. Reported or documented history of SARS-CoV-2 infection. 2. Contact or suspect of COVID-19 at the time of inclusion. 3. Body temperature equal to or greater than 37ºC. It will be possible to wait until 48 hours after the date in which the vaccination corresponds to apply it.4. Acute infectious disease at the time of the vaccine application or in the three days prior to the administration of the vaccine. 5. History of chronic diseases. 6. Children with a history of allergic diseases or diseases of the immune system. 7. History of having received a vaccine against SARS-CoV-2 or against other coronaviruses. 8. Have received any other vaccine, in the 14 days prior to the administration of each dose. 9. Use of any investigational product within 30 days prior to recruitment, or planned for during the study period. 10. Having been treated within the previous 30 days or the possibility of requiring treatment during the trial for any underlying condition with: immunomodulators (eg some type of Interferon, Transfer factor, Biomodulin T, Immunoferon, thymosin), or with steroids by any route of administration, or with cytostatics. 11. Have received blood, or any blood product within the three months prior to inclusion. 12. Allergy to Thimerosal or any other component of the formulation under study. 13. Pregnancy or breastfeeding. Positive urine pregnancy test, before the administration of any of the three doses in female participants who are biologically capable of having a pregnancy (history of menarche). 14. Tattoos in both deltoid regions that make it difficult to see the injection site. 15. History or suspicion of alcoholism or drug dependence.

1. Reported or documented history of SARS-CoV-2 infection. 2. Contact or suspect of COVID-19 at the time of inclusion. 3. Body temperature equal to or greater than 37ºC. It will be possible to wait until 48 hours after the date in which the vaccination corresponds to apply it.4. Acute infectious disease at the time of the vaccine application or in the three days prior to the administration of the vaccine. 5. History of chronic diseases. 6. Children with a history of allergic diseases or diseases of the immune system. 7. History of having received a vaccine against SARS-CoV-2 or against other coronaviruses. 8. Have received any other vaccine, in the 14 days prior to the administration of each dose. 9. Use of any investigational product within 30 days prior to recruitment, or planned for during the study period. 10. Having been treated within the previous 30 days or the possibility of requiring treatment during the trial for any underlying condition with: immunomodulators (eg some type of Interferon, Transfer factor, Biomodulin T, Immunoferon, thymosin), or with steroids by any route of administration, or with cytostatics. 11. Have received blood, or any blood product within the three months prior to inclusion. 12. Allergy to Thimerosal or any other component of the formulation under study. 13. Pregnancy or breastfeeding. Positive urine pregnancy test, before the administration of any of the three doses in female participants who are biologically capable of having a pregnancy (history of menarche). 14. Tattoos in both deltoid regions that make it difficult to see the injection site. 15. History or suspicion of alcoholism or drug dependence.