People who recover after being infected with the novel coronavirus can still be left with substantially weakened lung capacity, with some left gasping for air when walking quickly, doctors in Hong Kong have found.
The Hong Kong Hospital Authority made the findings after studying the first wave of patients who were discharged from the hospital and had fully recovered from COVID-19.
Out of 12 people in the group, two to three saw changes in their lung capacity.
"They gasp if they walk a bit more quickly," Owen Tsang Tak-yin, the medical director of the authority's Infectious Disease Centre, told a press conference Thursday, according to the South China Morning Post.
"Some patients might have around a drop of 20 to 30% in lung function" after full recovery, he said.
Tsang added, however, that patients can do cardiovascular exercises, like swimming, the improve their lung capacity over time.
While it's too early to establish long-term effects of the disease, scans of nine patients' lungs also "found patterns similar to frosted glass in all of them, suggesting there was organ damage," Tsang said, according to the Post.
Current coronavirus patients' CT scans show "ground glass," a phenomenon in which fluid builds up in lungs and presents itself as white patches, as Business Insider's Aria Bendix has reported. The scans below, taken from one coronavirus patient at different points in time, show that the person's "ground glass" became more pronounced as their illness progressed.
As of Friday morning, 356,655 had recovered from COVID-19 out of 1,603,719 confirmed cases, according to data. More than 95,722 people have died of the disease.
The disease appears to affect the elderly or infirm worse than any other demographic, as the outbreak in Italy has shown.
"Among those who are infected, most will recover," the World Health Organisation's director-general, Tedros Adhanom Ghebreyesus, said that:
The most commonly reported symptoms include a fever, dry cough, and shortness of breath, and some 80% patients will experience a mild illness, according to the WHO.
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