Even as it struggles to deliver shots into arms, Pennsylvania is expanding initial eligibility for the COVID-19 vaccine to include people age 65 and over as well as younger people with serious health conditions that put them at higher risk. The Health Department said its updated coronavirus vaccine plan tracks recommendations from the federal government, but it was uncertain how the expanded rollout would work given the slow pace of vaccinations so far and limitations on supplies. Some 3.5 million people are now eligible to get the vaccine; the state has vaccinated about 409,000.