COVID disease is an infection caused by a corona virus. Long COVID is a term to describe the effects of COVID-19 that continue for weeks or months beyond the initial illness. The health watchdog NICE defines Long COVID as lasting for more than 12 weeks.
Details of how some people are affected by Long COVID are still emerging, but research suggests around one in five people who test positive for COVID-19 have symptoms for five weeks or longer. For around one in ten people, they last 12 weeks or longer.