inclusion criteria: * informed consent from patient or legal representative. * subject of both genders (male and female not pregnant and not breastfeeding) aged 18 years or over; * subject that lives in a vulnerable community; * subject that were in direct contact with confirmed cases of sars-cov-2 infection, as they live or work directly with index patients; * not showing symptoms compatible with covid-19 and and that do not have a positive rt-pcr test in a nasopharyngeal swab sample before randomization; * participant capable of understanding and fulfilling all activities planned for the study; * in use of an acceptable method of contraception throughout the study.

inclusion criteria: * informed consent from patient or legal representative. * subject of both genders (male and female not pregnant and not breastfeeding) aged 18 years or over; * subject that lives in a vulnerable community; * subject that were in direct contact with confirmed cases of sars-cov-2 infection, as they live or work directly with index patients; * not showing symptoms compatible with covid-19 and and that do not have a positive rt-pcr test in a nasopharyngeal swab sample before randomization; * participant capable of understanding and fulfilling all activities planned for the study; * in use of an acceptable method of contraception throughout the study.

inclusion criteria: - informed consent from patient or legal representative. - subject of both genders (male and female not pregnant and not breastfeeding) aged 18 years or over; - subject that lives in a vulnerable community; - subject that were in direct contact with confirmed cases of sars-cov-2 infection, as they live or work directly with index patients; - not showing symptoms compatible with covid-19 and and that do not have a positive rt-pcr test in a nasopharyngeal swab sample before randomization; - participant capable of understanding and fulfilling all activities planned for the study; - in use of an acceptable method of contraception throughout the study.

inclusion criteria: - informed consent from patient or legal representative. - subject of both genders (male and female not pregnant and not breastfeeding) aged 18 years or over; - subject that lives in a vulnerable community; - subject that were in direct contact with confirmed cases of sars-cov-2 infection, as they live or work directly with index patients; - not showing symptoms compatible with covid-19 and and that do not have a positive rt-pcr test in a nasopharyngeal swab sample before randomization; - participant capable of understanding and fulfilling all activities planned for the study; - in use of an acceptable method of contraception throughout the study.