A study which found that aerosolized novel coronavirus could be spread nearly 15 feet — twice what health officials had believed — has been retracted, but the journal isn’t saying why.

Practical Preventive Medicine published the paper in early March. Titled “An epidemiological investigation of 2019 novel coronavirus diseases through aerosol-borne transmission by public transport,” the authors, from institutions in China, looked at the spread of the virus on a bus linked to one infected passenger.

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