95% carrier and 5% cases are seen in?

95% carrier and 5% cases are seen in ?
a) Measles
b) Diphtheria
c) Rabies
d) Hepatitis B
Correct Answer - B
Ans. is ‘b’ i.e., Diphtheria [Ref: Park 23rd/e p.160]
Diphtheria is caused by Corynebacterium diphtheriae, a gram-
positive bacterium.
Source of infection is either case or carrier, with carriers being the
most common sources of infection, their ratio is estimated to
be 95 carriers for 5 clinical cases. Nasal carriers are more
dangerous than throat carriers. Inmunuzation does not prevent
carrier state.