1. Moderate to high risk of exposure to infected patients during the study period. <br/ >2. Healthy at the time of enrolment without any symptoms suggestive of any viral infection.

1. Moderate to high risk of exposure to infected patients during the study period. <br/ >2. Healthy at the time of enrolment without any symptoms suggestive of any viral infection.

1. Moderate to high risk of exposure to infected patients during the study period. <br/ >2. Healthy at the time of enrolment without any symptoms suggestive of any viral infection.

1. Moderate to high risk of exposure to infected patients during the study period. <br/ >2. Healthy at the time of enrolment without any symptoms suggestive of any viral infection.