Archived: Here’s what we know about the mu variant

This is a simplified archive of the page at https://www.washingtonpost.com/world/2021/09/03/mu-coronavirus-variant-explained/

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Cases have been reported in the United States, Colombia, Japan, South Korea and parts of Europe.

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Coronavirus: What you need to know

The latest: The Food and Drug Administration approved new mRNA coronavirus vaccines. Here’s what you need to know about the vaccines.

Free tests: Americans can again order four free rapid coronavirus tests per household by mail through covidtests.gov.

Combined coronavirus and flu vaccine: A combined coronavirus-influenza vaccine may be on the horizon after Moderna’s shot produced a higher immune response in older adults than separate vaccines for those viruses administered together. Moderna officials say the earliest that the combined vaccine could hit the market is the fall of 2025, pending regulatory approval.

Covid isolation guidelines: Americans who test positive for the coronavirus no longer need to routinely stay home from work and school for five days under new guidance from the Centers for Disease Control and Prevention. Here are the latest guidelines.