Twenty six patients at the Royal Alexandra Hospital in Paisley have been struck down by a vomiting bug which has forced the closure of some wards.
Four wards at the hospital have stopped admitting new patients following the outbreak, suspected to be norovirus.
Across the wards a total of 26 patients are showing symptoms of the virus.
Dr Teresa Inkster, consultant microbiologist at NHS Greater Glasgow and Clyde, said: "Norovirus is particularly prevalent at this time of year and it’s not unusual to see this type of virus in the community and also in healthcare settings.
"We will continue to monitor this situation closely and strict infection control measures are in place.
"We are also urging any visitors who have experienced any symptoms of diarrhoea or vomiting within the last forty-eight hours not to visit the hospital.
"It is important to remember that this virus is extremely common in the wider community and therefore we would like to remind hospital visitors of the importance of hand hygiene when entering and leaving hospital premises."
Around 40 patients and six staff at Dumfries and Galloway Royal Infirmary (DGRI) have also been stuck by a bug thought to be the norovirus.
Three wards have been closed to new admissions and patient transfers after the first case was reported on Saturday.
The norovirus has led to more than than 1000 ward closures in Scottish hospitals over the past three years.
The total was highlighted by Liberal Democrat health spokeswoman Alison McInnes last month.
For more information on norovirus, visit the STV Health Centre, brought to you by NHS inform.
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