Nation Could COVID-19 vaccination bring relief for long-haul sufferers? Researchers want to find out. March 17, 2021 Karen Weintraub, USA TODAY Comments Off on Could COVID-19 vaccination bring relief for long-haul sufferers? Researchers want to find out. Somewhere between about 10% and 30% of people who catch COVID-19 end up with long-term symptoms referred to colloquially as long-COVID.