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Keeping Up

As new variants of SARS-CoV-2 arise, the Atlantic writes that tests for the coronavirus may need to be updated.

It notes that, currently, most tests are performing well, but adds that "keeping tabs on test performance is crucial, especially while the pandemic rages on in many parts of the world," and adds that the US Food and Drug Administration has put together a list of tests that could be affected by viral mutations.

Most tests in use in the US, the Atlantic says, detect specific parts of SARS-CoV-2's RNA genome, such as stretches of its nucleocapsid protein gene and spike protein gene. While changes to those viral genes may stymie tests' abilities to detect the virus, most tests detect multiple parts of the viral genome and can still determine whether the virus is present, it notes.

But going forward, the Atlantic writes that newer tests are both focusing on parts of the viral genome that are less likely to change and on multiple targets. "[R]esearchers and companies are keeping close watch, tracking the virus's many modifications and ensuring that tests are still up to snuff, similar to what's been done for years with the flu," it says. "Testing is, at its core, about keeping the virus in our line of sight — even through a costume change or two."

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.