The “most comprehensive study to date,” revealed that the physical distance and perhaps the use of a mask were the two best ways to prevent the transmission of new coronavirus.
The new study, published in the medical journal Lancet on Monday found the people should stay away from at least three feet and more if possible.
Examination of the various published studies, paid for by the World Health Organization, has three main conclusions:
The risk of transmission to a distance less than 1 meter (3.3 feet) was 12,8% and fell to 2.6% at a distance of more than 1 meter (3.3 feet) . He added that the distance of 2 meters (6.6 feet) might be more effective. He said that the certainty of the evidence was “moderate”.
Masks: the risk of transmission without a mask or respirator (like N95) was 17.4%, and fell to 3.1% when a mask was worn. However, the certainty of the evidence was “weak.”
Eye protection: Risk of transmission without eye protection has been set at 16%, compared to 5.5% with some form of eye protection such as face shields, visors, goggles or glasses. However, the certainty of the evidence was “weak.”
The researchers looked at 172 observational studies in 16 countries and six continents, including in health care studies and community settings. They did not look randomized controlled trials, considered the gold standard, but almost impossible to implement to study the transmission of infections in people.