Scientists spar over new report that recommends widespread use of face masks to stem coronavirus transmission

A new report advocating the widespread use of face masks to prevent coronavirus transmissions has become the bone of contention among scientists.

According to Delve's -- a multi-disciplinary group convened by the Royal Society report, published on Monday, face masks could reduce coronavirus transmissions if widely used in situations where physical distancing is not possible, such as busy public transport, shopping areas or workspaces.

But as it appears, the recommendation contrasts to the standard use of masks for the protection of wearers, suggesting face coverings could stymie transmission in symptomless carriers.

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The report has prompted other scientists to express their reservations, warning it amounted to no more than opinion and overstated the available evidence.

The said report is based on analysis of three key considerations, including the role of droplets as a route of transmission, and whether masks can help to reduce dispersal of droplets.

Many fear the evidence base is insufficient to warrant such conclusions.

"Our analysis suggests that their use could reduce onward transmission by asymptomatic and pre-symptomatic wearers if widely used in situations where physical distancing is not possible or predictable, contrasting to the standard use of masks for the protection of wearers. If correctly used on this basis, face masks, including homemade cloth masks, can contribute to reducing viral transmission," the report noted.

Experts say the report “falls short of delivering new evidence and too casually dismisses precautionary principle when addressing the possibility that masks and coverings could have negative effects on people’s behaviours”.

"This is not to say that face coverings might not be helpful. But the report does not accurately represent the evidence on face coverings that currently exists," an expert said.

Another expert said, "That is not a piece or research. That is a non-systematic review of anecdotical and non-clinical studies."

A professor at the University of Oxford, however, welcomed the report, saying it adds weight to the argument that face coverings by the general public could be part of a route out of lockdown.

"Medical-grade masks are not needed outside of healthcare settings. A cloth mask provides very good protection, and is more comfortable to wear," she said.

"Until more evidence is delivered in either direction, that’s all advice can be based on -- opinions," an expert concluded.