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Focus on the Severe

The US Centers for Disease Control and Prevention will no longer investigate mild cases of COVID-19 that crop up among vaccinated individuals, the New York Times reports.

The agency, it notes, had been monitoring all such breakthrough cases. There have been a reported 10,262 breakthrough cases, though that is widely considered to be an undercount, according to the Times. As they write in a Morbidity and Mortality Weekly report, agency researchers found that 27 percent of breakthrough cases were asymptomatic and 10 percent of patients were hospitalized, though some of those hospitalizations were unrelated to COVID-19

As the Times notes, the findings suggest that vaccines are working as hoped, and the CDC had shifted its focus to the most severe cases. "We have to prioritize what we're doing, and the priority is to understand the cases associated with severe disease," Vanderbilt University School of Medicine's Kathryn Edwards tells it.

The Times reports, though, that the move isn't without criticism as some argue the agency is letting potentially informative data slip away. "What if a variant arises that is less responsive or, Lord forbid, unresponsive to the vaccines?" Washington University in St. Louis' Michael Kinch, tells it. "The way you stop it is good old-fashioned epidemiology, which the CDC has historically done very well. But if you don't see it coming, you can't stop it."

The Scan

Pig Organ Transplants Considered

The Wall Street Journal reports that the US Food and Drug Administration may soon allow clinical trials that involve transplanting pig organs into humans.

'Poo-Bank' Proposal

Harvard Medical School researchers suggest people should bank stool samples when they are young to transplant when they later develop age-related diseases.

Spurred to Develop Again

New Scientist reports that researchers may have uncovered why about 60 percent of in vitro fertilization embryos stop developing.

Science Papers Examine Breast Milk Cell Populations, Cerebral Cortex Cellular Diversity, Micronesia Population History

In Science this week: unique cell populations found within breast milk, 100 transcriptionally distinct cell populations uncovered in the cerebral cortex, and more.