Disease highly transmitted during incubation period is -: (A) Peussis, (B) Cholera, (C) Measles, (D) Brucellosis
Answer is A. Whooping cough is most infectious during the catarrhal stage. The infective period may be considered to extend from a weak after exposure to about 3 weeks after the onset of the paroxysmal stage although communicability diminishes rapidly after the catarrhal stage. (refer pgno:163 park 23 rd edition)