Study Population The study population will be composed of health workers in the selected 7 hospitals, eligible for vaccination, with no contraindication to receive COVID-19 vaccine. Health Workers include all categories of staff working in the hospitals, including clinical and non-clinical/administrative staff and staff with direct patient interaction and those without direct patient interaction.  Criteria  Inclusion Criteria:  - All Health Workers in selected 7 hospitals eligible to receive the COVID-19 vaccination.  Exclusion Criteria:  Health Workers who are not eligible for COVID-19 vaccination or have a contraindication to vaccination. Health Workers who do not work at selected 7 hospitals.