One with an unknown etiology, whether ultimately due to infection or other processes. It is defined as a
temperature of at least 100.4°F (or 38°C), lasting 3 weeks or longer, and with no identifiable cause—often
referred to as FUO (fever of unknown origin).
temperature of at least 100.4°F (or 38°C), lasting 3 weeks or longer, and with no identifiable cause—often
referred to as FUO (fever of unknown origin).