1. Subjects (healthy / high risk) of either gender â?¥18 years of age <br/ >2. Subjects who have received 2 doses on Covaxin or Covishield with last dose 6 (+1) <br/ >months prior to screening date <br/ >3. Informed consent from subjects <br/ >4. Subjects literate enough to fill the diary card <br/ >5. Females of childbearing potential, must agree to use one of the approved contraception methods (double barrier methods, oral or injectable hormonal contraceptives or surgical sterilization), from screening until completion of the followup visit and males who agree to use contraception

1. Subjects (healthy / high risk) of either gender â?¥18 years of age <br/ >2. Subjects who have received 2 doses on Covaxin or Covishield with last dose 6 (+1) <br/ >months prior to screening date <br/ >3. Informed consent from subjects <br/ >4. Subjects literate enough to fill the diary card <br/ >5. Females of childbearing potential, must agree to use one of the approved contraception methods (double barrier methods, oral or injectable hormonal contraceptives or surgical sterilization), from screening until completion of the followup visit and males who agree to use contraception