Signs and symptoms
Signs and symptoms Most sensitive symptoms for diagnosing influenza [12] Symptom: sensitivity specificity Fever 68–86% 25–73% Cough 84–98% 7–29% Nasal congestion 68–91% 19–41% All three findings, especially fever, were less sensitive in people over 60 years of age. Symptoms of influenza, [13] with fever and cough the most common symptoms. [12] Approximately 33% of people with influenza are asymptomatic. [14] Symptoms of influenza can start quite suddenly one to two days after infection. Usually the first symptoms are chills and body aches, but fever is also common early in the infection, with body temperatures ranging from 38 to 39 °C (approximately 100 to 103 °F). [15] Many people are so ill that they are confined to bed for several days, with aches and pains throughout their bodies, which are worse in their backs and legs. [16] Symptoms of influenza Fever and chills Cough Nasal congestion Runny nos...
