NHS bosses have issued a public warning after an increase in norovirus cases.

People suffering from diarrhoea or vomiting are being urged not to visit family and friends in hospital due to a rise in the vomiting bug in the community.

They say the virus has been "particularly prevalent across the whole of Scotland over the last few weeks", which has resulted in a growing number of cases in some wards.

Four wards at Glasgow Royal Infirmary (GRI) are not accepting new patients as a result of the outbreak.

Wards with patients showing symptoms do not admit new patients as a precautionary measure and the ward is closely monitored with strict infection control measures in place.

A statement from NHS Greater Glasgow and Clyde said none of the patients are giving any cause for concern due to norovirus.

Dr Huma Changez, consultant microbiologist and infection control doctor at NHS Greater Glasgow and Clyde, said: "It's important that any visitors who have experienced any symptoms of diarrhoea or vomiting do not visit hospitals.

"I'd also urge hospital visitors to remember the importance of hand hygiene when entering and leaving hospital premises.

"The virus typically has a sudden onset and can spread quickly. Most people will recover from the virus within 24 or 48 hours.

"However, when people are very ill for other reasons, it can be more difficult for them to cope with diarrhoea and vomiting."