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The study analyzes the case of a 25-year-old man who was infected in two moments, in an interval of 48 days. The second infection was more severe, resulting in hospitalization with oxygen support.
This is the fifth confirmation of reinfection worldwide, according to the researchers. The other cases occurred in Belgium, the Netherlands, Hong Kong and Ecuador. However, only the reinfection case in Ecuador showed more severe symptoms than the first infection. The investigation did not consider the reinfection reports investigated in Brazil.
The specialist explains that reinfection by Covid-19 is rare so far, but possible
After testing positive for SARS-CoV-2 in April 2020, the Reno, Nevada resident tested negative for the virus on two separate occasions. In June 2020, after experiencing severe Covid-19 symptoms, including fever, headache, dizziness, cough, nausea, and diarrhea, he was hospitalized and tested positive for the second time.
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“There are still many unknowns about SARS CoV-2 infections and the immune system response, but our findings indicate that previous virus infection does not necessarily protect against future infections “said the study’s lead author, Mark Pandori.
The authors put forward some hypotheses to explain the severity of the second infection, such as a more virulent version of SARS CoV-2, a very high dose of the virus that caused a more acute reaction, or a simultaneous infection of both strains of the virus. Also, there is a very small chance of continued infection involving some form of inactivation / reactivation of the virus.
Cases of reinfection are not common, but people who have already been infected should continue to take care of themselves. “People who have tested positive for SARS CoV-2 should continue to take precautions when it comes to the virus, including social distancing, wearing face masks and hand washing,” Pandori warned.
“We need more research to understand how much Immunity can last for people exposed to SARS CoV-2. and why some of these second infections, although rare, present as more serious, “said Pandori.” We’ve only seen a handful of reinfection cases so far, but that doesn’t mean there aren’t more, especially since many Covid-19 cases are asymptomatic. Now, we can only speculate on the cause of the reinfection. ”
