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The Incidence of Arthropod-Borne Viruses in a Population of Culicine Mosquitoes in Tongaland, Union of South Africa (January, 1956, through April, 1960)^*

C. Brooke Worth, H. E. Paterson AND Botha de Meillon

From January, 1956, through April, 1960, 171,210 culicine mosquitoes from Ndumu, Natal, Union of South Africa, were inoculated into mice in 2,325 lots for attempted virus isolation. Fifty-nine recoveries of viruses were effected.

The viral isolates, including nine identified viral types, were recovered from nine species of mosquito, but among these the only ones principally concerned were Aedes (Neomelaniconion) circumluteolus (Theobald), Culex (Culex) univittatus Theobald, Mansonia (Mansonioides) africana (Theobald) and Mansonia (Mansonioides) uniformis (Theobald), in the order named.

The incidence of viral isolates in time and space at Ndumu indicates the possibility of the following assumptions having some basis in fact: (a) host specificity of most of the viruses concerned is not strict among genera of the tribe Culicini; (b) the virus types occurring in the Ndumu region may have undetected local cryptic cycles, their episodic reappearances being accounted for less by foreign reintroduction than by the occasional conjunction of ecological conditions that permits them to enter mosquito cycles detectable by current methods of investigation.

^* The studies and observations on which this paper is based were financed jointly by the South African Institute for Medical Research, the Poliomyelitis Research Foundation, the South African Council for Scientific and Industrial Research and The Rockefeller Foundation, and were conducted with the collaboration of the Union Health Department and the Veterinary Division of the Department of Agriculture.

Present address: The Rockefeller Foundation, 111 West 50th Street, New York 20, New York.

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