The Royal Cornwall Hospital of Truro, Cornwall, had to close three stations today. The facility has issued a black alert ("OPEL 4"), which the NHS classifies as a "serious incident".
Johanna Floyd, General Manager for Emergency Care in the Hospital, tweeted: "Royal Cornwall Hospital Opel 4 Three stations were closed with Norovirus."
"The staff work extremely hard."
What are the symptoms of Norovirus?
You may have been diagnosed with norovirus in case of sudden nausea, vomiting, and watery diarrhea.
Other symptoms may include mild fever, headache, painful cramps, and aching limbs.  Fortunately, the symptoms usually last only about two to three days.
If you think you have a contract, contact NHS directly but stay at home as there is no hospital treatment and you could use others at risk.
The symptoms do not last long and you usually feel well after a few days.
However, they are actually contagious for up to three days after your recovery – and some people may even be infectious for two weeks.
Norovirus is one of the most common stomach abnormalities in the UK and is also referred to as a "winter breaker", although this can affect people throughout the year.
It is very uncomfortable, but it usually clears itself up in a few days.
The virus spreads easily in public places and is transmitted when a tiny bit of vomit or feces from an infected person gets in gets the mouth of another person.
That sounds a little rough and unlikely, but it can happen – especially if you touch a contaminated surface and then put your hand in your mouth – or if you eat contaminated food.
You can also catch them when you are in close proximity to an infected person and they are breathing on you.
Dr. Sarah Jarvis, general practitioner and clinical director of patient.info, told Sun Online, "You do not just catch it from infected people, you can also choose to remove insects from surfaces.
"It is spread on the fecal oral route. So if you're infected, spread germs on Poo germs.
"It is also quite difficult to get rid of the germs by normal cleaning, you really have to wash yourself thoroughly.
London was hit by a serious illness in 2017, with several competitors and officials suffering from gastroenteritis.
Early January 2018 It was confirmed that hospitals in the northeast had imposed visitor restrictions as a result of a norovirus outbreak.
In the second week of January, it was announced that the cases had risen by a third in just one week.
Earlier this year, the British were warned of an outbreak in the West Midlands, the East Midlands, Yorkshire, and the Northeast.
It is believed that winter is worse when temperatures drop, but also when Christmas brings people closer together.
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