Incubatory carrier seen in -: (A) Cholera, (B) Bubonic plague, (C) Mumps, (D) Measles
Answer is C. Period of communicability of mumps : Usually 4-6 days before the onset of symptoms and a week or more thereafter. The period of maximum infectivity is just before and at the onset of parotitis. Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 165