Clinical Signs and Symptoms


Uncomplicated flu illness is characterized by the abrupt onset of: fever, bodyaches, headache, severe fatigue, sore throat, runny nose, and nonproductive cough. Among children with influenza illness, otitis media, nausea, and vomiting are also commonly reported.

The fever and body aches can last 3-7 days, while the cough and lack of energy may last for 2 or more weeks. Influenza can be difficult to diagnose based on clinical symptoms alone. Diagnosis is complicated because the initial symptoms of influenza can be similar to disease caused by other infectious agents. These agents include, but are not limited to: Mycoplasma pneumoniae, adenovirus, respiratory syncytial virus, rhinovirus, parainfluenza viruses, and Legionella spp.

Is it the Flu or a Cold?
Symptoms
Flu
Cold
Fever
High fever
Rare
Headache
Frequent and severe
Rare
Body aches
Frequent and severe
Slight
Fatigue
Frequent and severe
Mild
Stuffy nose
Sometimes
Frequent
Sore throat
Sometimes
Frequent
Cough
Frequent, severe
Frequent, moderate

Instant feedback:

Abrupt onset of severe fever, combined with severe aches & pains, is most likely:

A cold
The flu


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