Experiments are reported concerning the infection of Aedes (Stegomyia) aegypti Linn. with two arboviruses belonging to the Bunyamwera group, Ukauwa and Ilesha viruses.
Aedes aegypti was readily infected with Ukauwa virus by feeding upon sick enfant mice, feeding upon infected blood through a mouse-skin membrane, or by inoculation of virus into the insect, and high virus titres were attained.
Attempts to infect mosquitoes with Ilesha virus by ingestion failed, but this failure may have been due to the relatively low virus titres employed. Mosquitoes were infected with this virus by inoculation.
Aedes aegypti infected with both virus were able to transmit infection to baby mice, though their ability to transmit Ukauwa was considerably greater than for Ilesha virus.
It was concluded that Aedes aegypti may under certain circumstances function as an efficient vector of Ukauwa virus, and, to a lesser extent of Ilesha virus.