Johnson & Johnson's early vaccine trial results show most participants developed strong immune response

Johnson & Johnson logo.
(Image credit: AP Photo/Chris O'Meara, File)

Johnson & Johnson announced the start of phase three of its coronavirus vaccine trial this week, citing "positive interim results" from earlier stages of its study. Those were published Friday, and they were indeed promising.

The pharmaceutical giant reported that 99 percent of the participants between the ages of 18 and 55 in early-to-mid stage clinical trials developed neutralizing antibodies against the novel virus. The analysis also found that most of the side effects associated with the vaccine were mild and resolved within a matter of days.

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One of the key aspects of Johnson & Johnson's trial is that just a single dose produced a strong immune response in participants. Other companies developing vaccines like Moderna and Pfizer are using a two-dose approach. If Johnson & Johnson's phase three trial, in which 60,000 volunteers will enroll across three continents, eventually proves the single dose is safe and effective, it could simplify distribution of the vaccine. Read more at Reuters and CNN.

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Tim O'Donnell

Tim is a staff writer at The Week and has contributed to Bedford and Bowery and The New York Transatlantic. He is a graduate of Occidental College and NYU's journalism school. Tim enjoys writing about baseball, Europe, and extinct megafauna. He lives in New York City.