Answer 73
Yellow fever
True a. has an incubation period of 3-6 days
False b. has a case fatality rate of about 50%
True c. is caused by a flavivirus
False d. is spread by anopheline mosquitoes
False e. epidemics should be controlled by strict isolation of cases
ABORTIVE INFECTIONS ARE THE RULE. Severe classic infections occur in only 10-20% of those infected. 20-50% of severe infections are fatal. Yellow fever is spread by culicine mosquitoes: Aedes aegypti (peri-domestic) and Aedes haemogogus (sylvatic).
Epidemics are controlled by mass vaccination and use of insecticides.
