Experts are concerned a significant proportion of Covid-19 infected patients could be left with lung scarring, known as pulmonary fibrosis. 

The condition is irreversible and symptoms can include severe shortness of breath, coughing and fatigue. Research into the prevalence of lung damage caused by Covid-19 is still at a very early stage. 

It's thought those with a mild form of the disease are unlikely to suffer permanent damage. But those in hospital, and particularly those in intensive care or with a severe infection, are more vulnerable to complications. 

In a study from China, published in March, 66 of 70 patients still had some level of lung damage after being discharged from hospital. 

Radiologists in the UK say, based on the early results of follow-up scans, they are concerned about the long term-effects of a serious infection. 
Source : BBC