Flu (Influenza)

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Diagnosis

Flu symptoms are similar to those caused by other respiratory viruses. When the influenza virus is present in a local area, acute respiratory illness that also causes fever, muscle aches, malaise (feeling unwell), and extreme tiredness usually is the flu.


Secretions from the throat or nose can be used to make a definitive diagnosis of the flu. In these tests (e.g., nasal swab, nasopharyngeal swab, nasal wash), a sample of secretions from the nose and/or throat is taken using a...Read the full article