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People who received the Moderna COVID-19 vaccine had strong immune memory of SARS-CoV-2 six months after vaccination.
Natural immunity and vaccine responses may be weaker in people with immune suppression, so they should get their second dose promptly.
Another vaccine, from Novavax, was 89% effective in a U.K. trial, but both were less potent against the South African coronavirus mutation.
A slow vaccine rollout and the emergence of new coronavirus mutations threaten progress in reducing new cases and death.
The technology used in COVID-19 vaccines may also be used to prevent other viral infections and to treat cancer and multiple sclerosis.
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