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When worn correctly, a single face mask made of "appropriate material" typically offers enough protection, Paula Cannon, a distinguished professor of molecular microbiology and immunology at the Keck School of Medicine of University of Southern California (USC), said in an email. mvngowp3 BIDEN IMMIGRATION BILL WOULD PUT MILLIONS OF ILLEGAL IMMIGRANTS ON 8-YEAR FAST-TRACK TO CITIZENSHIP"I would be privileged to work with Congress to pass immigration reform legislation that provides that path and provides a permanent solution to what is clearly a broken system," he said. mvngowp3 CDC ORDERS FACE MASKS FOR US TRAVELERS"From 21 days after the first dose of vaccine (the day of dose 2), 16 (0.1%) of 14,964 participants in the vaccine group and 62 (1.3%) of 4,902 in the placebo group were confirmed to have COVID-19; vaccine efficacy was 91.6%," study authors wrote. mvngowp3 YOSEMITE NATIONAL PARK TEMPORARILY CLOSED AFTER WINDSTORM HITS CALIFORNIATo the southwest, forecasters say several locations may receive a few inches of heavy snow, creating hazardous travel conditions, before the system moves into the lower Mississippi Valley on Sunday. mvngowp3