Two more cases of hepatitis A have been confirmed by Public Health Wales following an outbreak at a primary school near Gelligaer.
There is a now a total of 11 cases of the viral infection after the initial outbreak at Glyn-Gaer Primary School earlier this month.
The latest case is of a pupil at Ysgol Rhydywaun, in Rhondda Cynon Taf, although Public Health Wales has said there is no suggestion the pupil caught the virus at their school and that they had links with Glyn-Gaer Primary School.
Public Health Wales has said it is continuing to investigate the outbreak with Aneurin Bevan University Health Board and Caerphilly County Borough Council.
Around 270 people associated with Glyn-Gaer Primary School have been vaccinated.
Heather Lewis, Consultant in Health Protection for Public Health Wales, said: “Children may have very few symptoms but can pass the virus onto others so we are reminding parents to encourage good hand washing at all times.”
She added: “We are confident that to date, all the public health actions needed to control this outbreak have been taken and that the risk to the public remains low. However, due to the very long incubation period of hepatitis A we may see more cases.”
Hepatitis A vaccinations are not routinely offered on the NHS as the infection is rare in the UK, with only 13 reported cases in Wales in 2012.