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And Now Spreading in the US

The SARS-CoV-2 variant identified in the UK, dubbed B.1.1.7, is now spreading in the US, the Washington Post reports. It adds that this variant is suspected to be more easily transmitted than the original pandemic strain and could soon become the dominant strain circulating in the US.

A Scripps Research Institute-led team examined the prevalence of the strain in the US based on both the slightly different pattern of PCR testing results it gives and follow-up sequencing of those samples. In a preprint posted to MedRxiv, they report that the strain was introduced into the US numerous times since the end of November 2020 and that, given that many initial B.1.1.7 US cases were not linked to international travel, there appears to be community transmission of the strain.

They further report that while this strain is currently at a low frequency in the US, it appears to be doubling every week and a half, the Post notes.

"There could indeed be a very serious situation developing in a matter of months or weeks," Nicholas Davies, from the London School of Hygiene and Tropical Medicine who was not involved in the study, tells the New York Times. "These may be early signals warranting urgent investigation by public health authorities."

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.