The incubation period is probably 5 to 15 days.
Convulsions are common during the early phase, particularly as the temperature rises.
Despite the high fever, the child is usually clinically alert and active. Lymphadenopathy is cervical and posterior auricular regions is often noted, and the spleen may be slightly enlarged. The temperature is normal at this stage, and the child feels and acts well. Treatment Treatment is symptomatic and includes antipyretic measures to keep the child comfortable.