1) Seroconversion for SARS-CoV-2 IgM; IgA and IgG among household contacts and index case;2) RT-PCR SARS-CoV-2 positive results at Day 1 (index case)/D2(household contacts); 7; 14; 21; and Month 1 in household contacts and index case.;3) Secondary attack rate of infection and illness for household contacts from index cases

1) Seroconversion for SARS-CoV-2 IgM; IgA and IgG among household contacts and index case;2) RT-PCR SARS-CoV-2 positive results at Day 1 (index case)/D2(household contacts); 7; 14; 21; and Month 1 in household contacts and index case.;3) Secondary attack rate of infection and illness for household contacts from index cases