The incubation period of yellow fever is -: (A) 3 to 5 days, (B) 3-4 weeks, (C) 1 to 2 weeks, (D) 8-10 weeks
Answer is A. <p> YELLOW FEVER:- Zoonoses disease caused by arbovirus. Affects principally monkeys and other veebrates and is transmitted to humans by culicine mosquitoes. Reservoir- mokeys and forest mosquitoes., in urban areas reservoir is man besides Aedes aegypti. A temperature of 24 deg celcius or more required for its multiplication. Incubation period:3-6 days Period of communicability- Blood of patients infective upto first 3-4 days {Reference: park&;s textbook of preventive and social medicine, 23rd edition, pg no.282}</p>