This is the best summary I could come up with:

“There was a residual risk of long Covid among vaccinated persons,” Dr. Clifford Rosen, a senior scientist at the MaineHealth Institute for Research, who was not involved in the study, wrote in an accompanying editorial.

The study evaluated medical records of millions of patients in the Department of Veterans Affairs health system.

“We found that much of the decline is attributable to vaccination,” said the study’s lead author, Dr. Ziyad Al-Aly, the chief of research and development at the V.A.

The study covered the time period from the initial emergence of the coronavirus through the arrival of two increasingly contagious variants — Delta and Omicron — after the rollout of vaccines.

Differences in variants and other aspects of the Delta and Omicron periods played a role, the authors said, but they attributed about 72 percent of the decrease to vaccines.

The researchers did not look at later time periods, but a recent survey by the Centers for Disease Control and Prevention reported that about 5.3 percent of adults in the United States — about 13.7 million people — currently have long Covid.

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