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Isolation of Ilhéus virus is reported from pools of the mosquitoes Psorophora lutzii, P. ferox, Culex nigripalpus and Aedes angustivittatus and from serum of the Scarlet-rumped Tanager, Ramphocelus passerinii, all captured in the vicinity of Almirante, Province of Bocas del Toro, in Panama during 1960 and 1961. Also 14.8% of 236 birds, 1.2% of 255 lower mammals and 14.9% of 643 human beings were found to possess neutralizing antibodies against this viral agent. The significance of these results is discussed.
* This investigation was supported by research grants E-2984 and E-4228 from the National Institutes of Health of the U. S. Public Health Service.
University of Panama School of Medicine, Republic of Panama.
Gorgas Memorial Laboratory, Apartado 6991, Republic of Panama.
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