PHILADELPHIA — The seven-day average of new coronavirus cases in Philadelphia is the highest it has ever been as both the delta variant and the extremely transmissible omicron variant spread through the region. The city was averaging 1,407 new cases per day as of Monday, surpassing the previous record of 1,235 set on Dec. 8, 2020. The number has shot up in recent weeks, increasing fivefold since Nov. 30. “The concern’s high,” said Patrick Kelly, an intensive care unit nurse at Einstein Medical Center, which is already near capacity with sick patients. “More people are in contact with people wh…

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