There are currently 17 cases of this Hepatitis A infection in South Wales.
Over 250 school children have had to be immunized against the viral infection following an outbreak in South Wales.
The children at some preschools namely, Kidz Den After School Club, Ysgol Rhydygrug in Aberfan, and Nursery Rhymes all in Treharris Community Centre are currently receiving vaccines to curb the infection spread.
Public Health Wales has confirmed that there are at least 17 cases of the viral infection in South Wales.
All the cases have links which can be traced back to the index case in Glyn Gaer Primary School, Caerphilly where the initial cases were identified and reported in April, earlier this year.
Heather Lewis, who works with Public Health Wales, thanked all members of the school nursing team who helped vaccinate the children in such a short time to help contain the outbreak.
Hepatitis A, like some viral infections, is usually short-lived and presents unpleasant symptoms. However, it is rarely serious, and children often have a very mild illness.
The symptoms of Hepatitis A may include some flu-like symptoms like tiredness, general body aches, and pains, fever, and headaches, as well as nausea and vomiting and loss of appetite. Abdominal pains, and jaundice, with itchy skin and very dark urine, can also be symptoms.
Since Hepatitis A infection is rare in the UK, vaccination is not regularly offered on the NHL, with just 12 reported cases in 2015 in Wales.
However, it is advised that any individual traveling to a nation where the infection is more prevalent, particularly Eastern Europe, Africa, Southern Europe, Northern and Southern Asia, and Central America, should receive this Hepatitis A vaccination alongside any other recommended travel immunizations by their GP.
Further information about the hepatitis A infection is available for the public on the Public Health Wales website.