Moderna says its COVID-19 shot 93% effective six months after second dose

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Moderna Inc said on Thursday its COVID-19 shot was about 93% effective through six months after the second dose, showing hardly any change from the 94% efficacy reported in its original clinical trial.

That compares favorably to data from Pfizer Inc and BioNTech SE last week in which they said their vaccine’s efficacy waned around 6% every two months, declining to around 84% six months after the second shot.

Both the Moderna and Pfizer-BioNTech vaccines are based on messenger RNA (mRNA) technology.

“Our COVID-19 vaccine is showing durable efficacy of 93% through six months, but recognize that the Delta variant is a significant new threat so we must remain vigilant,” Moderna Chief Executive Stéphane Bancel said.

However, a booster dose will be necessary prior to the winter season as antibody levels are likely to wane, Moderna said.

https://www.reuters.com/business/healthcare-pharmaceuticals/moderna-says-its-covid-19-shot-remains-93-effective-4-6-months-after-second-dose-2021-08-05/