Analysis

How common is long COVID? Why studies give different answers Nature - Enormous databases do not necessarily allow scientists to solve long COVID mysteries, such as how well vaccination protects against the condition. Ledford, Heidi nature

Clinical epidemiologist Ziyad Al-Aly has access to a treasure trove that many researchers can only dream of: millions of sets of electronic medical records from the US Department of Veterans Affairs (VA), which provides health care for the country’s military veterans.

Comparing the Pfizer and Moderna Covid vaccines for young children We’ve laid out what’s known about the differences in the vaccines for the youngest children in the hopes it will parents make their decision. Helen Branswell STAT

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There are two vaccines. Which do you choose?

We can’t tell you which is best for your child. But we can tell you that in this age group, the Pfizer-BioNTech and the Moderna vaccines probably differ more than they do in any other age group on the vaccination spectrum.

BA.4 and BA.5 Omicron: How worried should we be? Surges of Covid are happening again around the world, driven by some new subvariants of Omicron. BBC News

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Omicron Less Likely to Cause Long COVID, Data Suggest Odd of long COVID as high as 50% less during Omicron era Judy George medpagetoday

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About 4.5% of people who became infected with SARS-CoV-2 when Omicron was the dominant strain experienced long COVID symptoms, compared with 10.8% who became infected during the Delta period, reported Claire Steves, PhD, of King's College London in England, and co-authors...