Out of 10 relatives exposed to a primary case, of measles, 6 developed measles. Secondary attack rate of measles ?
Ans. is 'b' i.e., 6/10 Secondary attack rate (SAR) SAR is defined as "the number of exposed persons developing the disease within the range of incubation period, following exposure to primary case".
10-Apr
10-Jun
6-Apr
4-Jun