Doctors are warning that many people who contract the coronavirus, especially younger patients, are suffering aftereffects for a lengthy period of time despite subsequently testing negative for the virus.

"Most of them are in their 40s or younger. The government needs to take the issue seriously and implement countermeasures," one of the doctors said.

The aftereffects include malaise and difficulty breathing. In severe cases, patients became bedridden even though they had been diagnosed with a mild case of COVID-19 caused by the virus.