New vaccines designed to boost protection against new variants of the coronavirus have shown promise in preclinical studies, increasing the number of antibodies to a level comparable to that afforded by Moderna’s original Covid-19 vaccine, the company said in a release on Tuesday.

Moderna announced in February that it was developing variant-specific booster candidates both as specifically targeted booster shots, for patients who have already received the two-dose regimen that protects against ancestral…

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