A big problem with hepatitis A is that a food handler can shed the virus for a month without showing symptoms – and an infected customer may not show symptoms for a few weeks either. An incident that looks like it is over can linger. According to Hamilton New Jersey health officials, the virus has spread from a food handler at Rosa’s Restaurant and Catering to a salon employee.

Here comes another round of IgG shots.

Hamilton officials confirmed two more cases of hepatitis A in the township a month after a food handler at Rosa’s Restaurant and Catering first contracted the virus.

Health officials were notified late Wednesday night by Robert Wood Johnson Hospital Hamilton and the state Department of Health that an employee of The Hair Port Salon on South Broad Street was diagnosed with hepatitis A. The employee has been released from the hospital and is recovering at home, officials said.

Staff and customers who visited the salon between Dec. 4 and Wednesday may be at risk of contracting the virus and should be vaccinated if they have not already done so, officials said.

In the second case, hepatitis A was confirmed Thursday in a fitness instructor at the Hamilton Area YMCA’s JKR branch on Whitehorse-Mercerville Road, officials said.

Officials confirmed that both individuals had eaten at or from Rosa’s during the first case, but could not say with certainty whether the two additional cases were a direct result. Just last week, township health officer Jeff Plunkett said the incubation period was set to end Jan. 11 and no new cases had emerged at the time.