The coronavirus may have spread through the ventilation system at an apartment complex in South Korea where several residents from different households became infected, according to a study.The cluster was investigated after a series of new COVID-19 cases were identified in August on various floors of the residential complex in Seoul, according to the paper in the International Journal of Infectious Diseases.On Aug. 23, a woman living on the sixth floor tested positive, followed by her husband and daughter.SOUTH KOREA TO PROVIDE CORONAVIRUS VACCINES FOR 60% OF POPULATION: REPORTThe next day, a child who lived in the unit just below went to the hospital for a urologic problem and also tested positive for the virus, researchers wrote.When yet another woman who lived directly below them on the fourth floor was diagnosed with COVID-19, health officials decided to test all 437 residents.The mother of the infected child also tested positive, along with two more residents who lived in units directly above them on the 10th and 11th floors, researchers said.Two more cases were then found in other units on the second and 11th floors of the tower.Those units aren’t directly above or below the others, but are on the same vertical line

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