Public health officials in Glasgow are investigating a suspected outbreak of the norovirus bug after guests and staff fell ill at a hostel in the city.
NHS Greater Glasgow and Clyde said 23 guests and a member of staff at the Euro Hostel had displayed symptoms, including diarrhoea and vomiting.
Its public health protection unit is now investigating.
None of those who have fallen ill is giving cause for concern, the authority said.
Public health specialists and Glasgow City Council environmental health officers have put in place infection control measures.
Dr Eleanor Anderson, NHS Greater Glasgow and Clyde public health consultant, said: "The clinical presentation of these individuals is very suggestive of norovirus infection.
"We will continue our investigations to confirm the cause of the illness and will monitor the situation closely.
"Our advice to those guests in the hostel who are not symptomatic and to those who are due to check in is the same as it is for any community case - to follow strict hygiene rules such as regular hand washing.
There have been two outbreaks of the norovirus at Glasgow hotels in the past three months.
Last month, 15 guests and four members of staff fell ill at the Marriott hotel in the city centre.
And in July the norovirus bug was found to have caused an outbreak of vomiting and diarrhoea at the Hilton Hotel in Glasgow, which affected 63 guests and 20 members of staff.