True about measles is all except
Measles (Rubeola): Incubation period: 10-14 days. Causative agent: RNA Paramyxovirus (so for only one serotype known) Source of infection: Cases (Carriers are not known to occur) Period of communicability: 4 days before and 5 days after the appearance of the rash. (Rash is retroauricular in origin) Measles has no second attacks (life long immunity is seen) Secondary attack rate of measle is 80% Measles shows a cyclical trend: Increases every 2-3 years. Blood cell type predominantly infected in Measles: Monocyte. Pathognomic clinical feature: Koplik spots (on buccal mucosa opposite Lower 2nd molar) Pathognomic microscopic feature: Wahin Finkedly cells (Multinucleated giant cells) MC complication of measles in young children: Otitis media. SSPE: Subacute sclerosing pan Encephalitis. Is a rare complication of measles: 1 per 10000-100000 cases of Measles (7-10 years after initial infection) Epidemic of measles occur: If propoion of susceptible children is > 40% If measles is introduced in a virgin community it infects >90% of children. Eradication of measles: Requires a vaccination coverage >96% Baby measles (Exanthem subitum-roseola infantum): Sixth disease (3 day fever) Ref: Park 25th edition Pgno: 159
Kopliks spots appear as rash disappears
It is prevented by both active and passive immunization
Otitis media and meningitis are the most common complications
TB is aggravated in post measles
Communicable diseases