inclusion criteria: 1. sign the informed consent before initiating the selection procedures. 2. health system workers working in contact with subjects potentially infected with sars-cov-2. 3. people ≥ 18 years. 4. availability to meet the requirements of the protocol. 5. negative rapid serological test of sars-cov-2

inclusion criteria: 1. sign the informed consent before initiating the selection procedures. 2. health system workers working in contact with subjects potentially infected with sars-cov-2. 3. people ≥ 18 years. 4. availability to meet the requirements of the protocol. 5. negative rapid serological test of sars-cov-2

inclusion criteria: sign the informed consent before initiating the selection procedures. health system workers working in contact with subjects potentially infected with sars-cov-2. people ≥ 18 years. availability to meet the requirements of the protocol. negative rapid serological test of sars-cov-2

inclusion criteria: sign the informed consent before initiating the selection procedures. health system workers working in contact with subjects potentially infected with sars-cov-2. people ≥ 18 years. availability to meet the requirements of the protocol. negative rapid serological test of sars-cov-2

inclusion criteria: 1. sign the informed consent before initiating the selection procedures. 2. health system workers working in contact with subjects potentially infected with sars-cov-2. 3. people ≥ 18 years. 4. availability to meet the requirements of the protocol. 5. negative rapid serological test of sars-cov-2

inclusion criteria: 1. sign the informed consent before initiating the selection procedures. 2. health system workers working in contact with subjects potentially infected with sars-cov-2. 3. people ≥ 18 years. 4. availability to meet the requirements of the protocol. 5. negative rapid serological test of sars-cov-2