A lab scientist scans bar codes on saliva samples collected from members of the CU Boulder community. (Credit: Glenn Asakawa/CU Boulder)
A few "super carriers" with off-the-charts viral loads are likely responsible for the bulk of COVID-19 transmissions, while about half of infected people aren't contagious at all at the time of diagnosis, suggests a new CU Boulder analysis of more than 72,000 test samples.
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