When the pandemic started, most doctors seemed to think that COVID was an illness that typically lasted about two weeks. Now, we know a lot of people are still experiencing sometimes debilitating symptoms weeks and months after they were infected. A University of Pennsylvania clinic is trying to figure out why they are still suffering and how to treat them. WHYY health reporter Nina Feldman talked to several “long haulers” in the region about their experiences which range from physical problems to mental health concerns.