References(1) https://www.nhs.uk/conditions/flu/(2) https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/flu-influenza(3) https://www.nhs.uk/conditions/cough/(4) https://www.nhs.uk/live-well/healthy-body/10-winter-illnesses/(5) https://www.nhs.uk/conditions/chest-infection/
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