As the weather begins to get cooler there will again likely be a rise in respiratory viruses - including respiratory syncytial virus (RSV).
The virus, which is a common childhood illness, usually spreads in the UK each year from October and last for around five months - with infections peaking in December.
While the virus only causes a mild respiratory illness for most people - there are some warning signs to look out for as it can lead to severe respiratory disease.
The virus is usually responsible for 20,000 hospital admissions in under-ones every year, and children generally cope better with the virus as they get older.
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