The emergence of a handful of people reinfected by SARS-Cov-2 — including individuals in Hong Kong, Italy and the US — has sparked panic over the future course of the pandemic.
But what if immunity wanes, plunging humanity into a never-ending cycle of relapses? This is the stuff of nightmares. A crucial question to gauge the risk of re-infection is how many individuals develop antibodies and how long they last. Some experts worry that only those who suffer the worst Covid-19 cases produce an immune response that’s both sizeable enough and protracted enough to build up adequate antibodies. If this is true, the lucky ones who escape the worst symptoms — including most kids and young adults — will be more vulnerable to re-infection. offers some evidence to dispel such fears.
But the broader immune response is potentially good news for the efficacy of any vaccine and appears to confirm that re-infections, at least shortly after the first illness, may indeed be rare.
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