MASSAPEQUA PARK - Hundreds of congregants who attend a Massapequa Park church will return today not for Mass, but to receive a vaccination for hepatitis A.

Officials say an estimated 1,300 churchgoers may have been exposed to hepatitis A after an unidentified person who attended a Christmas Day Mass at Our Lady of Lourdes Church tested positive for the disease.

The symptoms of hepatitis A may range from mild to severe and include an abrupt onset of fever, fatigue, poor appetite, nausea, stomach pain, dark-colored urine and jaundice. Officials say the disease is rarely fatal and most people recover in a few weeks without any complications.

Vaccines are being offered at the church today from 9 a.m. to 3 p.m.