[Evgeniy_Sherbyn]

In nature, the rabies virus is labile; is inactivated by sunlight, heat, desiccation, and other environmental factors; and is not viable outside the host. Exposure occurs when there is penetration of the skin by teeth or direct transdermal or mucosal contact with infectious material, such as brain tissue or saliva. Almost all cases are caused by bites from infected mammals.

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