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The number of young adults with COVID-19 rose by 55 percent from early August to early September, as most colleges were bringing students back to their campuses, the Centers for Disease Control and Prevention said in a new report published Tuesday.

The federal agency's "Morbidity and Mortality Weekly Report" found that the incidence of COVID cases among people aged 18 to 22 years increased by nearly 63 percent from Aug. 2 to Aug. 29, then dropped off slightly through Sept. 5, accounting for the 55 percent rise. The increases were greatest in the Northeast (144 percent) and Midwest (123 percent). The increases were particularly sharp among white young adults, as seen below.

The CDC study includes its usual disclaimer that the increases in cases "were not solely attributable to increased testing."

The report suggested that multiple factors are likely at play, but said, "Because approximately 45 percent of persons aged 18-22 years attend colleges and universities and 55 percent of those attending identified as white persons, it is likely that some of this increase is linked to resumption of in-person attendance at some colleges and universities."

It concluded by stating, "Mitigation and preventive measures targeted to young adults (e.g., social media toolkits discussing the importance of mask wearing, social distancing, and hand hygiene), including those attending colleges and universities, can likely reduce SARS-CoV-2 transmission among their contacts and communities. Institutions of higher education should support students and communities by taking action to promote healthy environments."