True regarding Measles are all of the following EXCEPT
A. Prodromal stage is not infectious
B. Incubation period is 8 —12 days
C. High Secondary attack rate
D. Caused by RNA virus
Answer a (Prodromal stage is not infectious)
• Measles is caused by a RNA virus classified as Morbillivirus, belonging to paramyxovirus family. Infection is
transmitted by droplet spread from the secretion of the nose and throat usually 4 days before and 5 days after the
appearance of rash.
• Measles is highly infectious during the prodromal period and at the time of eruption of rash.
• Incubation period: 8—12 days. 3—4 days
