Carries are impoant in all the following except-
The only source of infection of measles is a case of measles. Carriers are not known to occur. There is some evidence to suggest that subclinical measles occurs more often than previously thought. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no.160
Polio
Typhoid
Measles
Diphtheria
Epidemiology