FILE PHOTO: Vials with a sticker reading, "COVID-19 / Coronavirus vaccine / Injection only" and a medical syringe are seen in front of a displayed Johnson & Johnson logo in this illustration taken October 31, 2020. REUTERS/Dado Ruvic/Illustration
LONDON (Reuters) - Johnson & Johnson launched a new large-scale late-stage trial on Monday to test a two-dose regimen of its experimental COVID-19 vaccine and evaluate potential incremental benefits for the duration of protection with a second dose.
The U.S. drugmaker plans to enrol up to 30,000 participants for the study and run it in parallel with a one-dose trial with as many as 60,000 volunteers that began in September.
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