Ventilation and Prolonged Exposure

We are told to keep six feet of distance from each other, but how effective is this the distance in preventing the spread of COVID-19?

The answer may well be, yes, it helps, but it is not the full answer.

In a new article published in the British medical Journal provides a fuller view of our risk of exposure.

Two metres or one: what is the evidence for physical distancing in covid-19?

Six feet may be okay if you are wearing a mask and are outside, but if you are in a poorly ventilated room with a COVID positive person for an extended period of time, you may be exposed even if you are wearing a mask.

The chart below does a great job of estimating your risk based on a number of different factors including ventilation, location, duration of contact, facial coverings, and a person silent, speaking or shouting.

The chart seems to say, it is as much about ventilation and prolonged exposure as it is about distance.


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