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N95 masks to be most effective at stopping COVID19 spread, find Indian scientists
By tracking the motion of a cough over successive images, the team estimated velocity and spread of the expelled droplets. N95 masks have the best effectiveness and completely contain the horizontal spread to between 0.1 and 0.25 metres, researchers said.
A disposable surgical mask greatly reduces this distance to between 0.5 and 1.5 metres, they said. "Even if a mask does not filter out all the particles, if we can prevent clouds of such particles from traveling very far, it's better than not doing anything," said Simha.
"In situations where sophisticated masks are not available, any mask is better than no mask at all for the general public in slowing the spread of infection," said Simha. The researchers also contradict the generally accepted notion that using an elbow to cover up a cough is a good alternative.
The found that unless covered by a sleeve, a bare arm cannot form the proper seal against the nose necessary to obstruct airflow. The researchers added that a cough is able to leak through any openings and propagate in many directions.
Simha and Rao hope their findings will put to rest the argument that regular cloth masks are ineffective, but they emphasise that masks must continue to be used in conjunction with social distancing. "Adequate distancing is something that must not be ignored, since masks are not foolproof," Simha added.
Source: greaterkashmir.com
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