| Ilheus encephalitis | An encephalitis caused by the Ilheus virus (genus Flavivirus) and endemic to eastern Brazil and other parts of South and Central America; transmitted by mosquitoes. (05 Mar 2000) |
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| Ilheus fever | A febrile illness caused by the Ilheus virus, an arborvirus (genus Flavivirus), and transmitted by a mosquito. See: Ilheus encephalitis. (05 Mar 2000) |
| Ilheus virus | A virus of the genus Flavivirus (group B arbovirus) first isolated in Brazil, later found in Colombia, Central America, and the Caribbean; the cause of Ilheus encephalitis and Ilheus fever. (05 Mar 2000) |