multiple infections lead to more health problems

This is the first large-scale study on the subject, and published in the journal Nature.

Until the results of this study, the health effects of Covid reinfections were not really known, in terms of the long term. American researchers wanted to know if multiple Sars-CoV-2 infections increased the risk of health problems and long Covid.

They conclude that people who have been diagnosed with Covid more than once are at greater risk of experiencing a series of serious health problems compared to those who have only had it once.

Covid reinfections: the framework of the study

How did the researchers do it? They combed through the anonymous medical records of 5.8 million citizens listed in the US Department of Veterans Affairs’ National Health Care Database.

It turns out that more than 443,000 people tested positive for Covid at least once between March 1, 2020 and April 2022.

The conclusion

Then the researchers compared the different health results of the groups obtained.

Ziyad Al-Aly, epidemiologist at Washington University in St. Louis and lead author of the study, sums it up to AFP: “people who were re-infected had an increased risk of all sorts of unwanted health problems”. Because he adds:

Even if a person has had a previous infection and been vaccinated – that is, they have benefited from double immunity, that of the previous infection and that of the vaccines – they are still susceptible to suffering adverse effects in the event of reinfection.

Various health issues

But what does this specialist mean by “all kinds of problems” ? The researchers mention, for example, heart and lung problems three times more frequent among people who have been reinfected. And the risk of death is doubled by reinfection.

These successive infections could also be at the origin of cerebral affections, renal pathologies or even diabetes. However, American academics acknowledge limitations to their findings. For example, the fact that they were largely based on a panel of white, older men.

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