Only a very small number of diseases are believed to be spread via aerosols, or tiny floating particles. These include measles and tuberculosis - two highly contagious pathogens that can linger in the air for hours and require extreme precautions to prevent exposure.The experts agree Covid-19 does not spread the same way as a typical airborne virus - floating down the streets for many hours and infecting people as it moves in and out of homes.
But it added that more research is"urgently needed to investigate such instances and assess their significance for transmission of Covid-19". Noting Covid-19 has a much lower reproduction number than highly infectious airborne diseases such as measles and chickenpox, he said:"We know the vast majority of people who get Covid-19 get it from close contact, and the reproductive number is generally around 2.5."
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