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

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

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  • Laboratory of the Yellow Fever Research Service, Rio de Janeiro, Brazil


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.