Disease highly transmitted during incubation period is -
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)
Peussis
Cholera
Measles
Brucellosis
Epidemiology