A party that dozens of Long Beach Island lifeguards attended has been linked to 35 cases of the virus, according to the state’s health commissioner. A house party in Middletown, N.J., has been blamed for 65 new cases; 52 of the people infected were between the ages of 15 and 19, Gov. Philip D. Murphy said. And a graduation party in Westfield, N.J., farther north, resulted in 17 cases.

Coronavirus cases have jumped by 28 percent. The governor pleaded “one more time to parents and kids”: Don’t gather inside.