Nipah is a rare but extremely dangerous virus, with reported fatality rates reaching as high as 75 percent. ALSO READ Pakistan Introduces New Requirement for Incoming Passengers After Nipah Virus Outbreak in IndiaWhile governments are increasing surveillance and traveler screening, health officials stress that awareness of symptoms is more important than panic. Symptoms of Nipah VirusEarly SymptomsThe virus can incubate in the body for four to 14 days before symptoms appear. Severe and Life-Threatening SymptomsIn more serious cases, Nipah infection can quickly worsen. Nipah virus is primarily transmitted from animals to humans, especially through direct contact with infected pigs or fruit bats, or exposure to their bodily fluids and secretions.