The New Jersey health care worker who was the state’s first coronavirus case says “nobody knows” when he’ll fully recover from the bug — and is struggling with weeks of isolation from his wife and little girl.

“I don’t know what’s exactly going on with me,” James Cai, 32, told The Post via text message.

Cai — who was initially hit with diarrhea, chest pains and a fever despite having no underlying medical conditions — remained in isolation Tuesday at Hackensack University Medical Center, where he’s been since March 2.

“I am getting better but at what extent? Nobody knows,” said Cai, adding that his frequent coughing has left him with rib pain.

The Fort Lee physician assistant said it’s been “very hard” battling the deadly bug away from his wife and 20-month-old daughter, who are in isolation.

Referring to his daughter, he said the little girl is “not herself when I am not around.”

“I am afraid to call her,” Cai said. “I may cry.”

Cai said he’s “not sure” when he’ll finally be discharged from the hospital since he needs to test negative for the coronavirus to be cleared for release.

He has said he believes he came down with the dangerous bug while attending a medical conference at the Westin in Times Square on the weekend of Feb. 28.

Cai is among at least 178 confirmed COVID-19 cases in the Garden State as of Monday afternoon, according to the Department of Health.