People commonly mistaken the flu (influenza) for the common cold, but the two are actually not the same1. The flu is a contagious respiratory illness caused by influenza viruses2. It can come on suddenly and people who have the flu will usually experience symptoms like fever, cough, sore throat, runny or stuffy nose, muscle or body aches, headaches, fatigue (tiredness), vomiting and, on rare occasion, diarrhoea (more common in children than adults)3.
Unfortunately, certain people may end up developing severe illness and serious complications that can sometimes lead to death3. Such complications include inflammation of the lungs (pneumonia), heart (myocarditis), brain (encephalitis) or muscle tissues (myositis), and multi-organ failure3.
The US Centers for Disease Control and Prevention (CDC) categorise these individuals into high-risk groups as follows:4
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