One of the reasons is due to the increased amount of virus in the nose and saliva in patients infected with Alpha strain. However, 18 times more virus was exhaled by the patient mainly because they had a higher viral load. The researchers also found that well-fitting face coverings could reduce the number of virus-containing patient droplets in the surrounding air by 50%.
“We know that the Delta variant is now even more contagious than the Alpha variant,” said researcher Don Milton of the University of Maryland School of Public Health.
“Our research shows that the variants will continue to move through the air better. So we need to use better ventilation and wear closed masks, in addition to vaccination, to help stop the spread of the virus.”