the proportion of subjects of Group 1 who become symptomatic and/or swab positive in each arm within 1 month from randomization.;the proportion of subjects of Group 2 who become swab negative in each arm within 14 days from randomization.

the proportion of subjects of Group 1 who become symptomatic and/or swab positive in each arm within 1 month from randomization.;the proportion of subjects of Group 2 who become swab negative in each arm within 14 days from randomization.