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Evidence is growing that contracting SARS-CoV-2 is generally as effective as vaccination at preventing COVID-19.
People who received the Moderna COVID-19 vaccine had strong immune memory of SARS-CoV-2 six months after vaccination.
What protects most children from becoming seriously ill? And why does that protection sometimes fail?
About half of people hospitalized with COVID-19 had antibodies that could mistakenly attack the body’s own proteins and tissues.
Scientific evidence appears to show that vaccine-induced immunity is stronger than what the body generates after natural infection.
Bamlanivimab and etesevimab may be given to people with mild to moderate COVID-19 who are at high risk for progression to severe disease.
More than 95% of people who recovered from COVID-19 had durable immune system memory up to eight months after infection.
Another vaccine, from Novavax, was 89% effective in a U.K. trial, but both were less potent against the South African coronavirus mutation.
Long-lived memory immune cells continue to provide protection even after antibody levels drop.
People who have had evidence of a prior infection appear to have some degree of protection against being reinfected with the virus.
Immune cells called T cells helped prevent reinfection and may be especially important if antibody levels are low or decline over time.
Agency grants emergency authorization for antibody cocktail given to President Trump.
Bamlanivimab is now authorized for nonhospitalized people at high risk for progressing to severe COVID-19.
The treatment reduced coronavirus levels and sped up recovery in a clinical trial.
Herd immunity occurs when enough people are immune to a disease that it is unlikely to spread within a population.
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