The J&J vaccine has some significant benefits over the vaccines that have a higher "protection" percentage.
Only one dose is required. It can be made available in large quantities quickly.
And the very big benefit, it keeps people out of the hospital.
Here's an article that gives some good info about the efficacy of vaccines...
...Everyone wants to know how well the vaccines work. But a key metric is hardly ever discussed.
The Food and Drug Administration is working through thousands of pages of documentation for an emergency authorization of the Johnson & Johnson vaccine, which could come through this month. Most states are gradually expanding vaccine eligibility, production of the Pfizer and Moderna mRNA vaccines is increasing, and new studies show good results for additional vaccine candidates as well.
The news on the Covid-19 vaccine front of late has been quite good " perhaps so good that our perspective on the fight against the pandemic may be getting a little warped.
Case in point: the media coverage and public reception of the Johnson & Johnson (J&J) vaccine. Results from its trials were released last week. According to the company, it should be able to deliver 100 million doses in the first half of this year. But this good news hasn't been greeted with the enthusiasm that accompanied announcements about the Pfizer and Moderna vaccines.
Perhaps that's because in its clinical trial, the J&J vaccine had an efficacy number -- the percentage of cases prevented entirely -- of 66 percent. Compared against the 95 percent efficacy rate for the Pfizer vaccine and the 94.1 rate for Moderna's, Johnson & Johnson's vaccine simply doesn't look as good.
But in another sense, the Johnson & Johnson vaccine trial results were incredibly encouraging. The same trial showed that J&J's vaccine makes Covid-19 cases much milder, meaning you might still get sick but you are much less likely to be hospitalized or die. Indeed, on that front, the J&J vaccine performs just as well as Pfizer's and Moderna's, a fact that seems to have been undersold in news coverage about it.
To put J&J's effectiveness in another context, think about the flu. Flu vaccines mostly don't prevent you from getting sick with the flu but instead make the flu much less awful if you catch it and less fatal for at-risk populations. A Covid-19 vaccine that was similar to that " one that made you much less likely to be hospitalized or die, and made the disease milder -- would still be enough to help bring the pandemic to an end and give us back our lives....
There's lots of good info in that article, worth the read, imo.