Frederic Bushman of the Perelman School of Medicine said the majority of COVID samples processed by his lab are of the delta variant. “We’ve been a little behind other places in the U.S, but now it’s here,” he said.
https://philadelphia.cbslocal.com/2021/08/02/covid-19-transmission-rates-move-into-substantial-range-across-majority-of-tri-state-region/ CBS Philadelphia