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These simple experiments illustrate how wearing a mask can stop the spreading of germs. In the study petri plates containing media to grow bacteria are exposed to an individual wearing a surgical mask or not. Conditions tested include coughing, sneezing, talking and singing. The results are striking. Masks block the ejection of droplets that contain bacteria. Exposed petri plates appear full of bacterial colonies when exposed to an individual who is not wearing a mask.
Experiments also confirm the effect of social distancing, and demonstrate how the individual does not spread bacteria to plates exposed at a distance of 6 feet away from the source. Although these experiments evaluate bacterial contamination, the droplets that carry these germs can also transport viruses such as SARS-CoV-2.
