Shorter incubation periods generally lead to more infections happening in less time, because people are becoming more contagious sooner, making onward transmission harder to prevent. Ajay Sethi, an epidemiologist at the University of Wisconsin at Madison, told me he still wants more data on Omicron before he touts a trim incubation. But “it does make sense,” he said, considering the variant’s explosive growth in pretty much every country it’s collided with. In many places, Omicron cases are doubling every two to three days.
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