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Studies on the Cyclic Passage of Yellow Fever Virus in South American Mammals and Mosquitoes¹

III. Further Observations on Haemagogus equinus as a Vector of the Virus

A strain of jungle yellow fever virus was maintained by alternate passage through marmosets and Haemagogus equinus for seven cycles, after which passages were voluntarily discontinued.

A comparison was made between the efficacy of H. equinus and A. aegypti as vectors of the virus, by submitting the two species to the same experimental conditions and by testing the mosquitoes individually through allowing them to feed upon baby mice at varying periods following the infective meal.

It was found that under the imposed experimental conditions 72 of 164 A. aegpti and 38 of 163 H. equinus transmitted the virus, thus giving a transmission of 43.9 and 23.3 per cent respectively, or an index of 0.53 for H. equinus as compared with an assumed index of 1 for A. aegypti.

¹ The work on which these observations are based was done under the auspices of the Serviço de Estudos e Pesquisas aôbre a Febre Amarela (Yellow Fever Research Service), which is maintained jointly by the Ministry of Education and Health of Brasil and the International Health Division of The Rockefeller Foundation.