COVID-19 vaccinations played a key role in the drop in Long COVID cases.

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For their study, Dr. Al-Aly’s team utilized databases within the VA to identify nearly 450,000 veterans who had been infected with SARS-CoV-2, as well as healthy controls. They divided this cohort into era-specific groups based on the SARS-CoV-2 variant: pre-Delta era (no vaccination), Delta era (no vaccination), Delta era (vaccinated), Omicron era (no vaccination), and Omicron era (vaccinated). They followed each group for a year to identify which one was most at risk for developing Long COVID symptoms. The researchers found that the rate of new Long COVID cases declined with each variant, and that the numbers of cases were significantly lower in the vaccinated cohorts.

https://www.yalemedicine.org/news/covid-vaccines-reduce-long-covid-risk-new-study-shows#:~:text=The bad news is%2C the,vaccinated people (primary series).