Prognosis
Moderna Booster Shot Bolsters Antibodies Against Variant Strains
- Two types of booster show early promise in mid-stage trial
- Boosters may help fight strains from South Africa and Brazil
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Moderna Inc.’s Covid-19 booster shots gave positive results against immune system-evading strains that emerged in South Africa and Brazil, according to early results from a mid-stage trial.
Two types of booster shots studied spurred higher levels of virus-halting antibodies against the variant strain P.1 that ravaged Brazil as well as B.1.351, common in South Africa, Moderna said in a statement. One of the boosters is an additional low-dose shot of its existing vaccine, while the other type is customized against the South Africa strain.