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Only the cases of people who, recovered from Covid for the first time, have contracted it again after weeks or months are increasing. To date there are 23 confirmed cases of reinfection in the world, and the second time is usually more serious. An 89-year-old woman died in Belgium on Tuesday after being reinfected two months later. It is true that he had previous pathologies but, the day before, a 25-year-old snowfall, without any health problem, recovered the Coronavirus a few months later, and the second time with much more serious symptoms, so much so that he had to be intubated.
If there are still few cases of reinfection, on the other hand, there are many who, having overcome the Cronavirus, have not contracted it again but, in the serological test carried out after a while, they were surprisingly free of the developed antibodies, as never before they had it. It also happened in Italy, for example, to actress Debi Mazar. The scenario raises worrying questions about the possibility of making a vaccine, unless it immunizes in the long term and does not need continuous boosters. Yesterday Johnson & Johnson joined the companies that abandoned the trial due to the difficulties encountered. There are many scientists who raise doubts on this point. Does everyone become immune? How long does the protection last?
The latest published study on ‘Lancet Infectious Diseases’, collected by the BBC, raises several questions about the actual immunity of the infected. In the case of the 25-year-old American, this is confirmed by comparing the genetic codes of the virus from samples taken while the patient was symptomatic: the sequences were too different to be caused by the same infection. In other words, it was not the original infection, which had become inactive and was manifesting again, but a new infection. “Our results indicate that a first infection may not necessarily protect against future infections – said Dr. Mark Pandori, University of Nevada -. The possibility of reinfection could have significant implications for our understanding of Covid-19 immunity.”
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