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Although it's not yet known how important this is to the spread of COVID-19, it underscores the need for strict social distancing measures. Pixabay

Normal speech by individuals who are asymptomatic but infected with coronavirus may produce enough aerosolized particles to transmit the infection, according to a new study.

Although it’s not yet known how important this is to the spread of COVID-19, it underscores the need for strict social distancing measures, according to the findings, published in the journal Aerosol Science and Technology.


“Aerosols are particles small enough to travel through the air. Ordinary speech creates significant quantities of aerosols from respiratory particles,” said study lead researcher William Ristenpart, Professor at the University of California, Davis in the US.

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These respiratory particles are about one micron, or one micrometre, in diameter. That’s too small to see with the naked eye but large enough to carry viruses such as influenza or SARS-CoV-2.

Last year, Ristenpart, graduate student Sima Asadi and colleagues published a paper showing that the louder one speaks, the more particles are emitted and that some individuals are “superemitters” who give off up to 10 times as many particles as others.


Normal speech by individuals who are asymptomatic but infected with coronavirus may produce enough aerosolized particles to transmit the infection, according to a new study. Pixabay

The reasons for this are not yet clear.AIn a follow-up study published in January in PLOS One, they investigated which speech sounds are associated with the most particles. Calculating just how easily a virus-like SARS-CoV-2 spreads through droplets requires expertise from different fields, the study said.

From virology, researchers need to know how many viruses are in lung fluids, how easily they form into droplets and how many viruses are needed to start an infection. Aerosol scientists can study how far droplets travel once expelled, how they are affected by air motion in a room and how fast they settle out due to gravity.

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“The aerosol science community needs to step up and tackle the current challenge presented by COVID-19, and also help better prepare us for inevitable future pandemics,” the researchers concluded. (IANS)


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