Here's what the latest research says
reached a less-encouraging conclusion: it found that vaccinated people were only about 15% less likely to develop Long COVID than their unvaccinated counterparts.
Studies have reached a wide range of estimates because of differences in how they were designed, how long they tracked people, and , says Dr. Ziyad Al-Aly, chief of research and development at the Veterans Affairs St. Louis Health Care System, a clinical epidemiologist at Washington University in St. Louis, and a co-author of thestudy. But regardless of the exact numbers, “the common thread is vaccines do offer some protection, but it’s never complete,” he says. “It’s partial.”
That makes sense, Al-Aly explains. The shots weren’t designed with chronic symptoms in mind, but rather to reduce the severity of acute disease, which offers some secondary benefits for Long COVID prevention. Though anyone can develop the condition,—so the fact that vaccines tend to keep cases milder hopefully means fewer people will develop lasting complications.
Early in vaccine distribution, some anecdotal reports also sparked hope that the shots could improve symptoms among people who already had Long COVID. But it’s still not clear whether that’s true. The authors of theresearch review couldn’t find a strong consensus in the 11 studies they analyzed on this topic: seven found that Long COVID patients’ symptoms improved after vaccination, while four found that they stayed the same or worsened.
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