Health officials in Texas recently confirmed a case of hepatitis A virus (HAV) at a daycare center in Dallas, and are now urging parents to look out for symptoms of the disease in their children, especially if they are not up to date on their vaccinations, CBS DFW reports.

The name of the Dallas daycare has not been released, but health officials have reported that a local childcare worker recently tested HAV positive. The warning states that any children or other employees at the center may have been exposed to hep A any time between October 1 and 20.

Adults have a greater risk of contracting hep A than children. However, since staying up to date on vaccinations is not necessarily required in Dallas daycare facilities, health workers are urging parents to look for signs of illness in their kids, and to get them vaccinated for HAV as soon as possible if they have not already.

Symptoms of hep A include nausea, fever, vomiting and jaundice (a yellowing of the eyes or skin) and generally start two to six weeks after exposure. Since the virus is commonly transmitted through fecal-oral contact, it has been known to spread through childcare facilities.