1)Adults aged 18 to 64 years at the time of consent, or elderly subjects aged 65 years or older at the time of consent. 2)Subjects who had received the 2nd dose of the initial series of SARS-CoV-2 vaccines (either Comirnaty or Spikevax[previously Moderna]) at least 6 months prior to signing consent.

1)Adults aged 18 to 64 years at the time of consent, or elderly subjects aged 65 years or older at the time of consent. 2)Subjects who had received the 2nd dose of the initial series of SARS-CoV-2 vaccines (either Comirnaty or Spikevax[previously Moderna]) at least 6 months prior to signing consent.