viruses causing hemorrhagic fever are initially transmitted to humans when the activities of infected reservoir hosts or vectors and humans overlap. the viruses carried in rodent reservoirs are transmitted when humans have contact with urine fecal matter saliva or other body excretions from infected rodents. the viruses associated with arthropod vectors are spread most often when the vector mosquito or tick bites a human or when a human crushes a tick. however some of these vectors may spread the virus to animals -- livestock for example. humans then become infected when they care for or slaughter the animals. some viruses that cause hemorrhagic fever can spread from one person to another once an initial person has become infected. ebola marburg lassa and crimean-congo hemorrhagic fever viruses are examples. this type of secondary transmission of the virus can occur directly through close contact with infected people or their body fluids. it can also occur indirectly through contact with objects contaminated with infected body fluids. for example contaminated syringes and needles have played an important role in spreading infection in outbreaks of ebola hemorrhagic fever and lassa fever.
how are hemorrhagic fever viruses transmitted?