Yellow fever a potential mosquito bite. Long-sleeved clothing, long pants, and socks are useful for prevention. The awareness of peak mosquito exposure is from dusk to dawn. The application of larvicides to water-storage containers can help eliminate potential mosquito breeding sites. Adult mosquitos can be killed through insecticide spray usage, which decreases the transmission of yellow fever. Vaccination is recommended for those traveling to affected areas, because non-native people tend to develop more severe illness when infected. Protection begins by the 10th day after vaccine administration in 95% of people, and had been reported to last for at least 10 years. WHO
Yellow fever on the African continent. In 2008, the largest number of recorded cases was in Togo. In 2016, a large outbreak originated in Angola and spread to neighboring countries before being contained by a massive vaccination campaign. In March and April, 11 cases were reported in China, the first appearance of the disease in Asia in recorded history. Phylogenetic analysis has identified seven genotypes of yellow fever viruses, and they are assumed to be differently adapted to humans and to the vector "A. aegypti". Five genotypes (Angola, Central/East Africa, East Africa, West Africa I, and West Africa II) occur only in