Delta-like SARS-CoV-2 variants are most likely to increase pandemic severity

A SARS-CoV-2 variant with traits similar to that of the Delta variant—enhanced transmissibility and an ability to infect people who had previous infections/vaccination—will cause a more severe pandemic with more infections and breakthrough infections/reinfections than variants with either trait alone, according to a mathematical model created by researchers at Harvard T.H. Chan School of Public Health.
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