Magnified approximately 34,000x, this transmission electron micrograph (TEM) depicted a tissue section that had been infected with Rift Valley fever (RVF) virus. RVF virus is a member of the genus Phlebovirus
in the family Bunyaviridae
and was first reported in livestock in Kenya around 1900. It is found to be an acute, fever-causing viral disease that affects domestic animals (such as cattle, buffalo, sheep, goats, and camels) and humans. RVF is most commonly associated with mosquito-borne epidemics during years of unusually heavy rainfall.