The incubation period of<unk>  encephalitis is usually 3–7 days. An early symptoms phase of 1–4 days commonly precedes the onset of encephalitis, manifesting as fever, chills, nausea, vomiting, headache, lethargy and abdominal pain. The encephalitis is characterized by fever, drowsiness, and lack of mental alertness and orientation. Seizures occur in 50% of children. Focal neurologic findings, like focal motor abnormalities and paralysis, irregular and abnormal reflexes develop in 20% of children. 10% of patients develop coma. The total duration of illness rarely exceeds 10–14 days. Recurrent unprovoked seizures occur even after the illness has passed develops in 20% of patients, especially those who had seizures during the acute illness. In adults, infection is asymptomatic, which means that the patient is a carrier of the infection, but experiences no symptoms or only mild feverish illness. The mortality rate is less than 1% and most patients with encephalitis clinical symptoms recover completely. Up to 20% of patients develop behavioral problems or recurrent seizures.
California encephalitis orthobunyavirus
Western equine encephalitis virus
Caño Delgadito orthohantavirus
Sepik virus
Dobrava-Belgrade orthohantavirus
Bayou orthohantavirus
Cricket paralysis virus
New York orthohantavirus