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(CNN) -
A new study on COVID-19 infections concludes that vaccines not only reduce the risk of severe illness and hospitalization, but can also lower the chances of having COVID-19 symptoms in the long term.
"We found that the chances of having symptoms for 28 days or more after post-vaccination infection were reduced by about half when receiving two doses of the vaccine. This result suggests that the risk of long-term covid is reduced in individuals who have received one. double injection, if you also consider the already documented lower risk of infection overall, "the researchers wrote in the study published Wednesday in the academic journal The Lancet Infectious Diseases.
The researchers, drawn from institutions in the United States and the United Kingdom, analyzed data reported by adults in the United Kingdom who shared any symptoms of Covid-19 using a mobile phone application called the "Covid Symptom Study." ).
The researchers examined those symptoms reported by app users who reported receiving the COVID-19 vaccine between December 8, 2020 and July 4, 2021, and compared the symptoms of those vaccinated with those of those not. vaccinated.
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The data included more than 1.2 million adults who reported receiving a first dose of the vaccine, and among them, 0.5%, or 6,030, tested positive for post-vaccination coronavirus infection after receiving that first dose.
Among nearly a million adults who reported receiving a second dose of the vaccine, only 0.2%, or 2,370, tested positive after receiving both doses.
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The researchers found that some groups were more vulnerable to post-vaccination infections than others, especially after the first dose of the vaccine: people aged 60 and over who were considered frail and those who lived in "highly disadvantaged areas," such as densely packed communities. populated.
The data showed that people who were not obese were less likely to become infected after the first dose of the vaccine.
But overall, the researchers found that being vaccinated was associated with fewer reports of symptoms across all age groups if someone got the coronavirus.
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The researchers found that vaccination, compared to no vaccination, was associated with a reduced chance of being hospitalized for COVID-19 or having more than five symptoms in the first week of illness after the first or second dose, and they were reduced the chances of long-term symptoms that lasted 28 days or more after the second dose of the vaccine.
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"Almost all individual symptoms of COVID-19 were less common in vaccinated participants than in unvaccinated ones," the researchers wrote.
"More people in the vaccinated groups than in the unvaccinated ones were completely asymptomatic."
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As for the long-term symptoms of COVID-19, some experts who were not part of the new study note that there is still much to learn.
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"Long covid is explored in this study by evaluating the proportion of cases with symptoms that persist for more than 28 days. However, long covid remains poorly understood and the persistence of symptoms after infection, as well as their severity, they have not yet been explored, "said Penny Ward, a visiting professor of Pharmaceutical Medicine at King's College London, who was not involved in the study, in a written statement distributed by the UK's Science Media Center on Wednesday.
"However, it is encouraging that the overall proportion of cases with persistent symptoms is reduced in patients who were previously fully vaccinated, which, together with the milder general illness and reduced need for hospital care, demonstrates the added value of vaccination in reducing the severity of disease for individuals, "Ward said, and reducing the burden on health systems by reducing the number of people needing hospital care.
Covid-19 Vaccine
