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After twenty minutes in normal indoor air, the coronavirus would lose 90 percent of its contagiousness. The risk of transmission of the disease appears to decrease rapidly, especially during the first five minutes after exhalation. That writes the British newspaper The Guardian on the basis of a new study.

jvhSource: BELGIAN

Yesterday at 17:19

The research team at the University of Bristol states in their study that most aerosols, or small air droplets, can no longer infect anyone after a few minutes. The research still has to undergo a peer review, but already points to special results.

The researchers tested the infectivity by floating virus-containing aerosols in an electric field for minutes. The aerosols were exposed to the influence of various environmental factors such as temperature, UV radiation and humidity. Finally, the researchers applied these air particles to cell cultures to see if they were still contaminated.

Humidity turned out to be an especially important factor. For example, at normal humidity, the aerosols would dry out and contract after a few seconds, making them 50% less contagious. In humid conditions, the particles remain contagious for a little longer, but eventually after about twenty minutes the risk of infection is only ten percent.

It is striking that temperature in the study appeared to have no influence on contagiousness. Several scientists have previously claimed that the virus spreads less quickly at high temperatures.

Previous studies and policy decisions often focused on the ventilation of spaces, but according to the researchers, this study points to the importance of measures such as social distancing and wearing a mouth mask. “I think the greatest risk of infection is still when you are close to someone,” said professor and researcher Jonathan Reid. But ventilation also remains an important tool in the fight against the virus, it sounds.

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