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People at risk for contracting the coronavirus will soon be barred from entering New York state court buildings, officials said.

The new measures, expected to take effect Friday, come after it was revealed that a lawyer who tested positive for COVID-19 Tuesday spent four days in a White Plains state courthouse last week. That courthouse has already asked potential carriers not to enter.

The notice says that people who have visited or who have been in contact with someone who has visited China, South Korea, Japan, Italy or Iran in the last 14 days shouldn’t enter the building. Those who have been instructed to self-isolate, are diagnosed with the virus or have flu-like symptoms are also barred, the posting says.

Similar warnings will appear on courthouse doors statewide Friday, Office of Court Administration spokesman Lucian Chalfen confirmed to The Post.

And if jurors feel sick, they have been advised to call the courts ahead of time so their jury duty can be postponed.

Chief Administrative Judge Lawrence Marks said in a letter to court employees Thursday that judges should consider postponing hearings and deadlines “whenever possible” — and conduct hearings by phone or video “to the fullest extent permitted by the law.”

Marks also said the courts are postponing “all use of courthouses for non-essential events, both during and after court hours.”

And, the courts have requested “more frequent and rigorous cleaning of court facilities statewide,” according to Marks’ letter.

“It’s too early to tell” what impact the new measures would have on defendants’ rights to a speedy trial, Chalfen said.

But Manhattan criminal defense lawyers say they are concerned for people in jail.

“[Jails] are a breeding ground,” lawyer Jonathan Rosenberg said. “There is nothing a virus loves more than a prison facility, and there is nothing people care less about than a prison facility.”

“I feel sorry for anybody who is stuck in a jail cell during this crisis,” Rosenberg said.

Still, “Accomodating a court calendar is not more important than accommodating public health,” Rosenberg said, adding he wishes the courts would issue more guidance on what lawyers and clients should do amid the outbreak.

“The delay factor that may be caused by the virus certainly has a greater impact because a defendant is in jail waiting for his matter to be heard,” Big Apple criminal defense attorney Michael Bachner said.

Legally speaking, the courts can allow trials to be delayed in extraordinary circumstances, Bachner said, noting that widespread case delays occurred after 9/11.

Bachner also added that it’s understandable that people who have jury duty wouldn’t be eager to pack into a jury assembly room with 200 or more people.

“That’s also going to raise issues regarding the social distance that people are supposed to maintain for themselves,” Bachner said. “We are in unknown territory here because we don’t know how long this will go on.”

The Westchester lawyer had been in both matrimonial and family courts in the building, prompting the courthouse to deep-clean two floors in the courthouse, the website says. Others who were in contact with the man have been notified and instructed to self-isolate, the site says.

This comes on the heels of another Westchester lawyer, Lawrence Garbuz, being diagnosed with the virus last week.

A mile-radius containment area has been set up around New Rochelle as a result of the spread from Garbuz — who was still in the hospital in a medically induced coma as of Tuesday — to others in the community.

Manhattan and Westchester federal courthouses issued similar protocols on Monday and they are also having inmates’ temperatures taken before they come into the courthouse.

The two federal courthouses Wednesday also canceled all non-case-related activities like school visits, mock trials and legal education for lawyers.