Researchers have found that covid-19 survivors may have protective immunity against serious disease from the SARS-CoV-2 virus for months, or even years after the infection.
Based on analyses of blood samples from 188 Covid-19 patients, researchers suggest that nearly all survivors of the disease have the immune cells necessary to fight re-infection, according to a study, published in the journal Science.
"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 researchers measured antibodies, memory B cells, helper T cells and killer T cells -- all four components of immune memory -- at the same time.
The findings help 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.