Two new cases of Hepatitis A have been confirmed in South Wales, bringing the overall total to 17.
Public Health Wales says a second pupil at Ysgol Rhyd-y-Grug, Aberfan, has the infection which is not life-threatening.
All pupils and staff will now be offered vaccination for Hepatitis A on Friday as a precaution.
Vaccinations will also be given to children and staff who attend Kidz Den After School Club and Nursery Thymes in Treharris Community Centre on Thursday.
This is because a potential risk of hepatitis A exposure has been identified in these groups from these new cases.
Symptoms include flu-like illness
All cases have links that can be traced back to Glyn Gaer Primary School in Caerphillywhere the first cases were identified in April.
Successful vaccination sessions have previously been held both in Glyn Gaer Primary School and at Ysgol Rhydywaun, a secondary school in Rhondda Cynon Taff where some of the cases are pupils.
Hepatitis A is a viral infection, usually short lived, which has unpleasant symptoms but is rarely serious. Children often only have a very mild illness.
Symptoms of hepatitis A can include flu-like illness such as tiredness, general aches and pains, headaches and fever, as well as loss of appetite, nausea or vomiting, abdominal pains, jaundice, very dark urine and itchy skin.
Heather Lewis, consultant in health protection for Public Health Wales, said: “These new cases are not unexpected.
“As we have already seen in this outbreak, the infection can spread to close contacts. We are taking every precaution to control the further spread of infection.
Help prevent the virus spreading
“However, as the incubation period for hepatitis A is so long and asymptomatic spread is common, we may well see additional cases before the outbreak is over.
“Although the infection is usually mild, if people develop symptoms that may be hepatitis A they should see their GP.
“It is important that people continue to help us prevent the virus spreading. The single most important thing everyone can do is to ensure they use good hand washing techniques after using the toilet and before preparing or eating food.”
Hepatitis A vaccination is not routinely offered on the NHS as the infection is rare in the UK, with only 12 reported cases in Wales in 2015.
However, it is advised that anyone travelling to a country where the infection is more common – particularly Africa, northern and southern Asia, Central America and southern and eastern Europe – should receive the hepatitis A vaccination along with any other travel immunisations recommended by their GP.
see-http://www.walesonline.co.uk/news/health/south-wales-cases-hepatitis-reach-11544415
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