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May 15, 2024 · Yellow fever virus has three transmission cycles: jungle (sylvatic), intermediate (savannah), and urban. The jungle (sylvatic) cycle involves transmission of the virus between non-human primates (e.g., monkeys) and mosquito species found in the forest canopy.
May 15, 2024 · When outbreaks occur in the urban environment, the virus primarily circulates between urban-dwelling mosquitos (primarily Aedes species) and people. People infected with yellow fever virus have high enough levels of virus in their blood (viremia) during the first few days of illness to transmit the virus to mosquitoes.
Feb 27, 2022 · A domestic (or urban) YF cycle is less common, and it occurs when the YF virus is introduced into highly populated areas with elevated mosquito density by infected people that, after having contracted the virus in the jungle or through the intermediate cycle, come back into the urban area.
- 10.3390/vaccines10030372
- 2022/03
- Vaccines (Basel). 2022 Mar; 10(3): 372.
Aug 23, 2018 · Yellow fever virus is transmitted by mosquitoes in one of two ways, via sylvatic (forest) or urban (city) transmission. Most recent cases of YFV in Brazil have been traced back to forest...
Jan 10, 2022 · In Brazil, the urban cycle of yellow fever, in which YFV is transmitted between humans through the bite of the domestic mosquito Aedes aegypti, has not been recorded since the early 1940s.
There are two yellow fever transmission cycles: the jungle cycle and the urban cycle. In the jungle cycle, the virus circulates among nonhuman primates and perhaps among susceptible marsupials.
Nov 8, 2023 · Yellow fever is a high-impact, high-threat disease, with a risk of international spread, representing a potential threat to global health security. There are 3 types of transmission cycles: Sylvatic (or jungle) yellow fever spreads when monkeys are bitten by wild mosquitoes that pass the virus on to other monkeys and humans.
