COVID-19 symptoms.“The purpose of this is to try to detect people who may have some scarring or potentially other lung conditions that are explaining their symptoms,” said Jason Weatherald, an assistant professor of Respirology a the University of Calgary. ‘I’m scared’: Coronavirus long-haulers claim they’ve been left to fend for themselves “The long-term effects of COVID are still incompletely understood, but we know that up to 30 to 40 per cent of people may still experience shortness of breath,” Weatherald said.