Science

A Third COVID-19 Vaccine Could Have 90% Effectiveness—Thanks to a Trial Error

HAPPY ACCIDENT

Some participants were mistakenly given a half dose of the vaccine at first, and then the full dose later—proving more effective than two full doses.

Arya Hodjat
Arya Hodjat 

Former Breaking News Intern

GettyImages-1229653876_ckefzy
Justin Tallis/Getty
Arya Hodjat

Arya Hodjat

Former Breaking News Intern

arya_kidding_me

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