Catching Covid for the second time is usually less severe, but sometimes it is more:
"A 25-year-old man from Nevada and a 42-year-old man in Virginia experienced second bouts of COVID-19 about 2 months after they tested positive the first time. Gene tests show both men had two slightly different strains of the virus, suggesting that they caught the infection twice. Researchers say these are the first documented cases of COVID-19 reinfection in the U.S. About two dozen other cases of COVID-19 reinfection have been reported around the globe, from Hong Kong, Belgium, the Netherlands, India, and Ecuador. A third U.S. case, in a 60-year-old in Washington, has been reported but hasn't yet been peer reviewed.
The second reinfection has more severe symptoms during than the initial infection, potentially complicating the development and deployment of effective vaccines."
https://www.medrxiv.org/content/10.1101/2020.09.22.20192443v1.full.pdf
"Until now, immunologists haven't been too concerned about these reinfections because most second infections have been milder than the first, indicating that the immune system is doing its job and fighting off the virus when it is recognized a second time.
Unlike most of those cases, however, the men in Reno, NV, and Virginia, and a 46-year-old man in Ecuador, had more severe symptoms during their second infections, potentially complicating the development and deployment of effective vaccines."
"A 25-year-old man from Nevada and a 42-year-old man in Virginia experienced second bouts of COVID-19 about 2 months after they tested positive the first time. Gene tests show both men had two slightly different strains of the virus, suggesting that they caught the infection twice. Researchers say these are the first documented cases of COVID-19 reinfection in the U.S. About two dozen other cases of COVID-19 reinfection have been reported around the globe, from Hong Kong, Belgium, the Netherlands, India, and Ecuador. A third U.S. case, in a 60-year-old in Washington, has been reported but hasn't yet been peer reviewed.
The second reinfection has more severe symptoms during than the initial infection, potentially complicating the development and deployment of effective vaccines."
https://www.medrxiv.org/content/10.1101/2020.09.22.20192443v1.full.pdf
"Until now, immunologists haven't been too concerned about these reinfections because most second infections have been milder than the first, indicating that the immune system is doing its job and fighting off the virus when it is recognized a second time.
Unlike most of those cases, however, the men in Reno, NV, and Virginia, and a 46-year-old man in Ecuador, had more severe symptoms during their second infections, potentially complicating the development and deployment of effective vaccines."
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