The symptoms start to appear within 3-14 days of Nipah virus infection. When people first get Nipah virus infection, it looks like some other diseases. People get fever, headache, throat pain and feel very tired. They find it difficult to breathe. Later, they get much sicker. They feel dizzy and might become unconscious. As of now, we know 582 cases of humans infected with Nipah virus, out of which approximately half died. 