<prompt> The incubation period of yellow fever is -3 to 5 days3-4 weeks1 to 2 weeks8-10 weeks  <response>: 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 