Screening for tuberculosis is being offered to 124 pupils at a school in Llanelli, after a member of staff was diagnosed with the infection.
Letters have been sent to parents at Ysgol y Strade today, to offer them blood tests next Thursday.
Public Health Wales says the risk that the infection has spread to pupils is "low" and screening is being offered as a "precaution."
The 124 pupils at the secondary school are those identified as having around eight hours of close contact with the member of staff.
Tests will also be offered to 21 members of staff identified as close contacts of the patient.
More top news
Stephanie Owen says her ex-partner became controlling, before he began following her and bombarding her with phone calls, texts and emails.
New research says the average working couple in Wales would have to save for around 5 and a half years for a deposit on their first home.
Cloudy with outbreaks of rain and strong winds too. The rain persistent and at times heavy over high ground.