Covid Catchup: All the Developments You May Have Missed

The latest and most concerning pandemic revelations, in brief

The coronavirus SARS-CoV-2 can replicate only after using its spike proteins to bind with receptors on human cells, then injecting its genetic code into a host cell, as depicted in this artist’s impression, then hijacking the host cell’s reproduction machinery. Credit: SCIGRAPHIX / S. Westermann

Given Covid fatigue, you’re excused if you cut down on doomscrolling and tried to ignore the bad pandemic news as 2020 wound down. But welcome to 2021. Covid-19 hospitalizations and deaths continue rising in the United States and elsewhere, vaccine rollouts are proceeding slower than hoped, and a post-holiday surge in cases looms.

Here are brief summaries of several important recent developments and ominous trends:

Coronavirus mutant strains are everywhere

As viruses routinely do, SARS-CoV-2 has been gathering mutations since its emergence a year ago. Most have proven benign and largely unimportant, but recently evolved strains, including in England and South Africa, are up to 70% more infectious, mounting evidence indicates.

The most widespread and concerning mutated strain is the U.K. version called B.1.1.7. Its spike proteins, the protrusions you’ve seen on countless illustrations, bind more readily with human cells, allowing it easier entry. The strain has been found in California, Colorado, Florida, New York, and 33 countries, and is expected to spread swiftly and widely.