Answer: b- Persons are considered infectious from day four
before the onset to rash to four days after the appearance of rash.
Measles have an incubation period of 7 to 21 days, but
persons are infectious at day 4 before the onset of rash to four days after the
appearance of rash, and the measles virus is airborne and infectious for 2
hours. The two doses of MMR vaccine are sufficient to provide immunity of
around 97%, about 92%-95% of the population must be vaccinated for measles
virus in order to prevent ongoing transmission.
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