Health
Airborne propagation of COVID-19 occurs more rapidly indoors and is confirmed by new research
People traveling the Delhi Metro in the COVID-19 pandemic.
(Sunil Kumar / BCCL Delhi)
New studies have been added to the ever-growing evidence that aerial propagation of COVID-19 occurs more rapidly in confined spaces.
Researchers have been able to correlate outbreaks of COVID-19 in the Chinese community with patients from sources of infection who may have spread the virus to fellow bus riders via the air conditioning system of the bus.
“Our study provided epidemiological evidence of long-distance transmission, which was probably levitation,” said Yeshen, the lead author of the study at the University of Georgia, USA.
According to research, it was published in the journal JAMA Internal MedicineIt was widely believed that close contact through droplets was the main transmission route for COVID-19.
“But widespread social distance and hand-washing have not been able to effectively prevent global infections. Instead, the number of new COVID-19 cases has steadily increased,” Shen said. Told.
The research team worked with epidemiologists at two regional Centers for Disease Control and Prevention in China to track the infection after a major outdoor worship event in Zhejiang.
Some of the participants participated in the event on two buses and conducted a unique natural experiment on the researchers. According to study co-author Changwei Li, both buses had closed windows and air conditioning, but one bus carried a patient infected with the virus and the other did not.
Of the passengers who later became ill, the majority boarded the same bus as the original patient.
Although the two groups later mixed with a larger crowd at the worship event, the number of new cases resulting from the event was much smaller, suggesting that the bass was the primary transmission point.
In addition, it was found that some of the bus passengers who later showed symptoms of COVID-19 were not sitting near the infected passengers.
These findings highlight a scenario in which COVID-19 may spread through fine aerosol particles circulating in an enclosed space.
“Understanding the COVID-19 transmission route is important to contain the pandemic, so we can develop effective preventive strategies for all potential transmission routes,” Shen said. Says.
“Our findings firmly support covering the face in a closed, poorly ventilated environment,” the study author writes.
Another study recently published in the journal Minutes of the National Academy of SciencesDiscovered that normal conversation creates a conical “jet-like” airflow that quickly carries a spray of small droplets into the interior space a few meters from the speaker’s mouth.
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