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These included not only people sitting relatively close to “patient zero”, but also a couple of victims six rows from him – roughly 4.5 metres away.
They all later tested positive, including one passenger who displayed no symptoms of the disease.
After these passengers left, another group got on the bus about 30 minutes later. One passenger sitting in the front row on the other side of the aisle also became infected.
Hu said the patient, who was not wearing a mask, was likely to have inhaled aerosols, or tiny particles, breathed out by the infected passengers from the previous group.
Aerosols are light-weighted particles that are formed from tiny droplets of bodily fluids.
“The possible reason is that in a completely enclosed space, the airflow is mainly driven by the hot air generated by the air conditioning. The rise of the hot air can transport the virus-laden droplets to a greater distance,” said the paper.
After getting off the shuttle bus, the initial carrier got on a minibus and travelled for another hour. The virus jumped to two other passengers, one of whom was also sitting 4.5 metres away from patient “A”.
By the time the study was finished in mid February, patient “A” had infected at least 13 people.
https://www.scmp.com/news/china/science ... e-and-stay
