Window period in HIV infection ?

Ans. is 'b ' i.e., 4-8 weeks Window period It takes 2-8 weeks to months for antibodies to appear after infection. This period, from infection to appearance of antibodies, is called as window period. During this period patients is seronegative i.e. serological tests (ELISA and Western blot) are negative. o The individual may be highly infectious during this period.