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" ... The team, from the University of Maryland, San Jose State University, Missouri Western State University and University of California, Berkeley had people with confirmed flu infection come into the lab and spend some time in the “Gesundheit-II human source bioaerosol sampler,” a machine that collects and analyzes exhaled breath. During the first three days of being sick, 140 participants breathed, coughed, and sneezed naturally inside the machine; they also spoke when the researchers prompted them. Samples of their exhalations during these activities were collected and analyzed to detect flu, both active virus and pieces of RNA that are merely detectable. ... "