Does low antibody levels of the coronavirus raise questions about reinfection risk?
In COVID-19 antibody testing, the implications for long-lasting or even short-term immunity is uncertain. Some people who recovered from COVID-19 may not generate antibodies at all, but that may not mean they’re not immune. For instance, a study showed that of 175 COVID-19 patients in China, about 30% (who tended to be younger) had very low levels of antibodies but still recovered well. And it’s also possible that the body makes different antibodies than what is being tested, meaning you could be immune but still test negative. It is also being studied now if recovered coronavirus patients have a higher risk of reinfection after finding surprisingly low levels of Covid-19 antibodies in a number of people discharged from hospital.
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