Two years old 3 months darling ate antipyretic still do not have a fever, how to do

Two years and three months baby took antipyretic or not fever, consider is due to the presence of serious bacteria, virus infection, the cause has not been lifted, so persistent fever. Suggest parents to take their children to see a doctor in time, clear the cause after taking amoxicillin and other antibiotics or acyclovir and other antiviral drugs treatment.