A mosquito sample collected three decades ago in Israel's Negev Desert has yielded an unexpected discovery: a previously unknown virus that's closely related to some of the world's most dangerous mosquito-borne pathogens but, curiously, incapable of infecting non-insect hosts. “This virus is unique — it's related to all of these mosquito-borne viruses that cause disease and cycle between mosquitoes and animals, and yet it is incapable of infecting vertebrate cells," said UTMB graduate student Farooq Nasar, lead author of a paper on the virus now online in the Proceedings of the National Academy of Sciences. The news also appears in the Times of India and HealthCanal.com.