Social history of viruses of encephalitis, of which 105 were fatal, were recorded. A new paramyxovirus was discovered in a victim's brain; it was named Nipah virus, after the village where he had lived. The infection was caused by a virus from fruit bats, after their colony had been disrupted by deforestation. The bats had moved to trees nearer the pig farm and the pigs caught the virus from their droppings. Several highly lethal viral pathogens are members of the "Filoviridae". Filoviruses are filament-like viruses that cause viral haemorrhagic fever, and include the Ebola and Marburg viruses. The Marburg virus attracted widespread press attention
Morogoro virus contact, as this has been suggested for other arenaviruses. Morogoro virus Morogoro virus is an East African arenavirus of which the multimammate mouse ("Mastomys natalensis") is the reservoir host is. The virus is genetically closely related to Lassa virus, known to cause Lassa fever in humans. Morogoro virus, however, does not seem to infect humans. Transmission of Morogoro virus between mice is assumed to occur via direct and indirect contact. Infected animals pass a latent period of 7 days and subsequently shed the virus for about 30 days, after which they recover and develop lifelong antibodies. Transmission may also be