The board overseeing New York City’s jails urged officials to start releasing vulnerable populations and those being held on low-level offenses as the coronavirus outbreak hit the notorious Rikers Island complex and nearby jails — infecting at least 38 people. Another inmate, meanwhile, became the first in the country to test positive in a federal jail. “Fewer people in the jails will save lives and minimize transmission among people in custody as well as staff,” Board of Correction interim chairwoman Jacqueline Sherman wrote in a letter to New York’s criminal justice leaders this weekend. “Failure to drastically reduce the jail population threatens to overwhelm the City jails’ healthcare system as well its basic operations.”