Immunity to Covid-19 could vanish after a few months, U.K. study finds
Antibody responses to the coronavirus can peak three weeks after the initial onset of symptoms, but then begin to decline after as little as 2-3 months, researchers at Kings College London found.
Antibody responses to the coronavirus can peak three weeks after the initial onset of symptoms, but then begin to decline after as little as 2-3 months, researchers at Kings College London found., examined the antibody levels of 64 patients and six healthcare workers who had tested positive for the virus at Guy's and St Thomas' NHS foundation trust between March and June. It also monitored an additional 31 members of staff who volunteered to have regular antibody tests.
The levels of antibodies were higher in patients who had more severe disease, although it is not clear why,The researchers noted that their study found the antibody response to Covid-19 was similar to that of other human coronaviruses, such as SARS and seasonal coronaviruses associated with common colds, in which an individuals' antibody response tends to "wane over time, from as little as 12 weeks to 12-34 months after infection.
"We need to continue to measure antibody responses in these individuals to see if antibody titres continue to drop or plateau to a steady state," she said. Antibody titres refer to the presence, and amount, ofThe research calls into question how much protection individuals who have had the coronavirus have from subsequent reinfection, and the durability of any potential vaccine, citing similar studies that suggest immunity may wane after a few months.
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