Covid-19 survivors may have protective immunity against serious disease from the SARS-CoV-2 virus for months, or even years after the infection, a study suggests. The findings, based on analyses of blood samples from 188 Covid-19 patients, suggest that nearly all survivors of the disease have the immune cells necessary to fight re-infection.

"Our data suggest that the immune response is there -- and it stays," Professor Alessandro Sette from La Jolla Institute for Immunology in the US. The study, published in the journal Science, helps clarify some concerning data from other institutes, which showed a dramatic drop-off of Covid fighting antibodies in the months following infection.

Some feared that this decline in antibodies meant that the body wouldn't be equipped to defend itself against reinfection. Sette explained that a decline in antibodies is very normal. "That's what immune responses do. They have a first phase of ramping up, and after that fantastic expansion, eventually, the immune response contracts somewhat and gets to a steady-state," Sette added

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