The CDC has cited the estimate to back up its recommendation that vaccinated individuals do away with masks in certain outdoor situations, but should keep wearing masks during others.
According to the Times, the 10% benchmark is based "partly on a misclassification" of some virus transmission in Singapore at various construction sites that may have actually taken place in indoor settings. Singapore also classified settings that were a mix of indoors and outdoors as outdoors, including construction building sites, the outlet reported.
Still, the number of cases reported at the various sites did not add up to as much as 10% of transmission, but was more like 1% or less, the report stated.
