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Description:This diagram illustrates the methods by which the arbovirus, yellow fever is transmitted to humans and non-human primate hosts by Aedes spp. mosquitoes, in the case of human transmission, and Haemagogus spp. mosquitoes, in the case of both non-human primates and humans.
Yellow fever virus has three transmission cycles: jungle (sylvatic), inter¬mediate (savannah) (not included here), and urban.

- The jungle (sylvatic) cycle (depicted here) involves transmission of the virus between nonhuman primates (e.g., monkeys) and mosquito species found in the forest canopy. The virus is transmitted by mosquitoes from monkeys to humans when humans are visiting or working in the jungle.

- In Africa, an intermediate (savannah) cycle exists that involves transmission of virus from mosquitoes to humans living or working in jungle border areas. In this cycle, the virus can be transmitted from monkey to human or from human to human via mosquitoes.

- The urban cycle (depicted here) involves transmission of the virus between humans and urban mosquitoes, primarily Aedes aegypti. The virus is usually brought to the urban setting by a viremic human who was infected in the jungle or savannah.

High Resolution: Click here for hi-resolution image (18.48 MB)
Content Providers(s):CDC
Creation Date:1969
Photo Credit:
Links:CDC - National Center for Emerging and Zoonotic Infectious Diseases (NCEZID); Division of Vector-Borne Diseases (DVBD); Yellow Fever
CDC Organization
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Copyright Restrictions:None - This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.