Carriers are not an important source of transmission in the following disease: (AIPG 11)
Carriers are not involved in transmission of measles but the other diseases mentioned as options definitely involve carriers in their transmission.
Reservoir of Infection-
- Human – (cases and carrier)
- Reservoir in non-living things
Subclinical cases: Subclinical infection occurs in most infectious disease, e.g. rubella; mumps; polio hepatitis A and B, Japanese encephalitis, influenza, diphtheria.
Latent infection: Host does not shed the infectious agent which lies dormant within the host without symptoms. Latent infection occurs in herpes simplex; Brill-Zinsser disease, infection due to slow viruses, ancylostomiasis, etc.
Incubatory carriers: Measles, mumps, polio, pertussis, influenza, diphtheria and hepatitis B.
Convalescent carriers: Typhoid fever, dysentery (bacillary and amoebic), cholera, diphtheria and whooping cough.
Healthy carriers: Poliomyelitis, cholera, Meningococcal meningitis, Salmonellosis and Diphtheria
Animal Reservoir: - Rabies
- Yellow fever
Reservoir in non-living things