While most patients who caught COVID-19 ended up making a full recovery, some are dealing with long-term effects of the coronavirus.

In an analysis of 12 patients who recovered from the SARS-CoV-2 coronavirus, doctors at the Hong Kong Hospital Authority (HKHA) found that several of them now have reduced lung capacity, according to Business Insider.

“They gasp if they walk a bit more quickly,” Owen Tsang, medical director of the HKHA’s Infectious Disease Center, said in a press conference. “Some patients might have around a drop of 20 to 30 percent in lung function.”

After scanning the patients’ lungs, doctors saw signs of organ damage.

That’s far too small a sample size to declare that COVID-19 necessarily causes long-term damage, but it could be a warning sign that doctors should keep an eye out for potential complications.

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