Americans should be wearing N95 masks for greater protection against the highly contagious COVID-19 Delta variant, according to Dr. Scott Gottlieb, former head of the Food and Drug Administration (FDA). Gottlieb told CBS News’s “Face the Nation” on Sunday that the quality of a mask matters in protecting against the strain, which was first identified in India in late 2020, and currently makes up approximately 83 percent of all new sequenced COVID-19 cases in the United States, according to federal officials. “If you’re going to consider wearing a mask, the quality of the masks does matter,” he said. “So if you can get your hands on a KN95 mask or an N95 mask, that’s going to afford you a lot more protection.” Experts say that medical-grade respirators such as N95 masks offer greater protection against more infectious strains of COVID-19, such as Delta, which is believed to be more transmissible than …