There are an estimated 1.4 million cases of hepatitis A annually worldwide, according to WHO.
Thirty people have been infected with acute hepatitis A, and nine of them have been hospitalized.
The world's first combined hepatitis A and typhoid vaccine is launched in the UK on Monday.
Hepatitis A causes flu-like symptoms and anyone concerned should contact their GP, said Public Health Wales.
Four children are being treated following an outbreak of hepatitis A in Swansea, say health officials.
He said hepatitis A was a "short-term infection that has very unpleasant symptoms but is rarely serious".
Hepatitis A spreads by mouth via traces of fecal matter from an infected person, the health department said.
Hepatitis A is usually transmitted via contaminated food or water, or by someone who's infected, according to the Mayo Clinic website.
That's distinct from another common form of the disease, hepatitis A, which takes a fecal-oral route via food or household objects.
Hepatitis C has been described as an "approaching epidemic" - and unlike hepatitis A and B, there is no vaccine against it.
Hepatitis -- the most common types being hepatitis A, B and C -- refers to inflammation or viral infections of one's liver.
Hepatitis A is rarely fatal, although those with liver disease or a weakened immune system could require hospitalization, according to the health department.
International travel is among the most common hepatitis A risk factors, accounting for 15% of U.S. cases in 2005, a CDC study found.
"But a lot of other diseases which do exist in the area are real, " he said, such as hepatitis A and other vaccine-preventable diseases.
"Mild cases of hepatitis A don't require treatment, and most people who are infected recover completely with no permanent liver damage, " the Mayo Clinic website says.
Over 200 diners and workers at a New York eatery have been vaccinated for hepatitis A after an employee handling desserts revealed she had the virus.
An employee handling sweets at the Alta tapas restaurant between March 23 and April 2 was infected with hepatitis A, New York City's health department said.
The vaccine provides protection for hepatitis A for patients over 15 years for a minimum of 12 months and protection against typhoid fever for up to three years.
An average of 65 cases of Hepatitis A occur in New York City each year, with one or two occurring in food handlers, according to the health department.
Hepatitis A and B can be prevented with vaccines, which are recommended for all children -- and for adults who are at high risk of contracting viral hepatitis.
WHITEHOUSE: Presidential Proclamation -- World Hepatitis Day, 2012
The hepatitis A virus can survive in sea water for a number of weeks - meaning these people could contract the disease if the local sea water has been contaminated.
However, a large number were planning to take part in activities that may increase their risk of contracting diseases such as hepatitis A, which can be caught through contaminated food and water.
The 254-nanometer light kills the hardy waterborne polio virus, rotavirus (which causes vomiting, diarrhea and dehydration), the bacterium that causes cholera, the virus that gives rise to hepatitis A, and cysts of cryptosporidium (a nasty parasite).
New York (CNN) -- More than 200 people received hepatitis A vaccinations over the weekend after learning that a Manhattan restaurant employee handling sweets was infected with the virus, according to the New York City Department of Health and Mental Hygiene.
According to the CDC, it takes less than a minute for E. coli to be inactivated if chlorine levels are adequate, about 16 minutes to control Hepatitis A virus, about 45 minutes to kill off the Giardia parasite and over 10 days for a Crypto parasite.
Since type A hepatitis is a virus, it cannot be treated with antibiotics, but it is rarely deadly, the health department said.
Among the hits: a Hepatitis B vaccine, a treatment for inter-cranial aneurysms and a bovine growth hormone.
As a leading cause of liver cancer and related complications, viral hepatitis presents a major public health challenge at home and abroad.
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