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Hundreds of thousands of COVID-19 vaccines haven’t been used in Pa. and N.J. Here’s why, and what’s next.

A myriad of logistical challenges and other factors slowed down the rollout of the coronavirus vaccine in Pennsylvania and New Jersey. Here's what happened-- and how fast the pace is now accelerating.

The first doses of the Pfizer-BioNTech COVID-19 vaccine are delivered to Penn Medicine's Pennsylvania Hospital on Tuesday, Dec. 15, 2020.
The first doses of the Pfizer-BioNTech COVID-19 vaccine are delivered to Penn Medicine's Pennsylvania Hospital on Tuesday, Dec. 15, 2020.Read morePenn Medicine