NEW YORK — In the latest bizarre medical development for the baffling New York Mets, ace pitcher Noah Syndergaard is headed back to the disabled list after contracting hand-foot-and-mouth disease.

The team figures it’s likely Syndergaard caught the contagious virus when he made an appearance at a baseball camp for kids last Thursday during the All-Star break. Mets manager Mickey Callaway said that probably explains why Syndergaard weakened and his velocity decreased during Friday night’s victory at Yankee Stadium.

“Hand-foot-and-mouth, are you serious? I guess it’s very uncommon in adults, period,” Callaway said Sunday. “It’s kind of odd. Maybe the first DL stint in Major League Baseball with hand-foot-and-mouth? I don’t know. A record or something.”

According to WebMD.com, hand-foot-and-mouth disease is an infectious disease that “most often occurs in children under 10 and is characterized by a rash of small blister-like sores on the palms of the hands, soles of the feet, and in the mouth. Symptoms include fever, sore throat, and headache.”

The disease can spread from one person to another through saliva or fluid from blisters, among other things, and the infection normally passes in a week. The only treatment is a pain reliever such as acetaminophen, according to the website.

New York was planning to recall rookie right-hander Corey Oswalt from Triple-A Las Vegas to pitch in Syndergaard’s place Wednesday. But that could change after Sunday night’s scheduled game against the Yankees was postponed by rain. It will be made up on Aug. 13.