Two metre rule is outdated: researchers

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Two metre rule is outdated: researchers
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COVID-19 transmission depends more on environment, numbers, length of contact time and masks. Via: healthing_ca

Instead, transmission is more complex than a single blanket rule. In some instances, droplets with SARS-CoV-2 can travel up to seven to eight metres from an infected person when they’re breathing out, singing, coughing, or sneezing because of the warmth, moistness, and high momentum of the exhaled air.

For example, researchers note that when people are vigorously exercising, heavy panting “produces violent exhalations with higher momentum than tidal breathing,” which can be similar to coughs. Heavy breathing and panting will further the distance the droplets can reach. However, this is easily diluted with outdoor air. A preprint study from Japan found the risk of transmission isThe indoor factor is also important because not all infected people will be coughing.

Researchers say distancing rules need to account for the different environments, whether it’s indoors or outdoors, how many people are there, what they are doing, and whether they’re wearing face masks The highest risk situations are those indoors with poor ventilation, crowds who have prolonged contact time, and those who aren’t wearing face masks. Researchers give the example of a crowded bar or nightclub. Other epidemiologists have saidgiven theatres’ air conditioning and poor ventilation, prolonged time spent with others, and lack of ability to mandate masks in the dark.

Outdoor areas are the most well ventilated. If you’re indoors, places where people only spend a short amount of time, where everyone is wearing face masks, and where people are mostly silent have the lowest risk of transmission.

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