<prompt> Disease highly transmitted during incubation period is -PeussisCholeraMeaslesBrucellosis  <response>: 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 