A bacterial infection that can cause potentially deadly illnesses has broken out at Harland and Wolff shipyards in Belfast.
The Public Health Agency (PHA) said the pneumococcal disease had been detected in a number of employees.
The bacteria can cause a variety of infections, including pneumonia, meningitis and blood-poisoning.
It is understood four employees have been struck down, with tests being carried out on others.
A spokesman for the PHA said: “The Public Health Agency (PHA) is working with the Health & Safety Executive Northern Ireland (HSENI) and Port Health colleagues to investigate a cluster outbreak of pneumococcal disease at Harland and Wolff, Belfast.
“A small number of employees working at Harland and Wolff have been confirmed as having pneumococcal disease.
“The PHA is working closely with Harland and Wolff and hygiene advice has been given to employees. Vaccination is being offered to employees working in high risk exposure areas as a preventative measure.”
The PHA said there was no wider risk to the public.