WBUR – Massachusetts received 58,000 doses of the Johnson & Johnson coronavirus vaccine this week, the first shipment of what could be a substantial boost in vaccination efforts here and across the country. But it’s not clear how that boost will play out or when it will start. Gov. Charlie Baker says he’s not expecting any more J&J deliveries until late March or early April.

And Baker hasn’t spelled out how Massachusetts might target the J&J vaccine given its unique advantages: it’s a single dose shot, and it can be moved around a lot — even jostled — without risking stability.

Seventy-two percent of Americans who received the J&J vaccine in trials were protected from a mild to moderate case of COVID-19, as compared to more than 90 percent for the vaccines from Moderna and Pfizer-BioNTech. The three are similar at preventing the worst outcomes: hospitalizations and death. Public health and medical experts are urging people to get any vaccine offered.

“If someone offered me any one of those three vaccines, I absolutely would be comfortable and would be very willing to take any one of those three,” said Dr. Paul Biddinger, who chairs the vaccine advisory board in Massachusetts.

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