Nearly two dozen people contracted hepatitis A from a food handler at an exclusive New Jersey golf club this summer, according to officials and a new report.

The 23 people came in contact with the rare, contagious virus at the Mendham Golf & Tennis Club sometime between June 9 and 30, the Daily Record reported.

One person remained “seriously ill” as of Thursday, New Jersey Department of Health spokeswoman Donna Leusner told the outlet.

The Morris County Office of Health Management received a laboratory report for the infected person on July 2 — and an investigation confirmed that the individual was a food handler, the township said in a public notice posted to its website.

The handler was excluded from work and required to provide a doctor’s clearance in order to return, the office said. No food that may have been handled by the infected handler was noted.

Three days later, the office notified those who had been exposed to the virus.

“There was no delay,” Larry Ragonese, spokesman for the Morris County Office of Health Management, told NJ.com. “As soon as the hospital notified the state and the state sent their notice through their system … that information came to Mendham Township and to their health officer.”

The outbreak was contained to the members-only club, township officials said.

The health management office also recommended that any exposed and unvaccinated individuals be treated within two weeks of the last day the handler was infectious and working at the club.

Additional cases could possibly develop until Monday, which marks 50 days from the date the handler was last infectious, according to the health management office. The incubation period for hepatitis A is 15 to 50 days.

“While individuals with hepatitis A may be quite ill, the risk of transmission is to those who had close contact to the case and patrons of the club who consumed food prepared by the ill worker,” the state Health Department said in a statement obtained by NJ.com.

The club remained “cooperative in taking all recommended actions” throughout the investigation, according to the township.

“We have taken a number of actions to safeguard our members, guests, and employees,” club general manager Joseph Kelly wrote in a statement obtained by the Record.

He noted that the club is following recommendations from the health management office and the state Health Department.

“We are grateful for the guidance provided by both agencies and for the ongoing support of our members as we address this issue,” Kelly said.

Adults with hepatitis A, a communicable disease of the liver, can experience symptoms such as fatigue, low appetite, stomach pain, nausea and jaundice, which usually resolve within two months of infection, according to the CDC. The best way to prevent the disease is through vaccination.