A good COVID-19 vaccine is good enough

Experts have been looking forward to seeing results from Johnson and Johnson’s COVID-19 vaccine trials for months. The vaccine is a logistical dream compared to the other two authorized in the US. It’s much easier to store, and it requires only one shot instead of the two required by its competitors. The only outstanding question was how well it actually worked. On Friday, they got their answer — it works pretty well.

In a 43,783 person trial that spanned the globe, the vaccine was 66 percent effective at preventing moderate to severe COVID-19. Now, 66 percent might seem like a let down compared to the 90-plus percent efficacy from Pfizer/BioNTech and Moderna. But that’s a matter of perspective. Before results of those vaccine trials...

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