How booster shots can protect Americans from delta variant - PBS NewsHour

William Brangham:

The rationale is twofold.

One is the Delta variant that we all know so well, which is this incredibly contagious strain that is sickening people and filling hospitals, sickening largely unvaccinated people and filling hospitals all over the country.

The second is a small number of studies that are showing that some — these two vaccines, the mRNA vaccines, are slightly waning in their efficacies, going from something of 90-plus percent, down to 40 to 50 percent.

Now, that waning of efficacy is about your ability to get infected. We still believe that these vaccines are very good at protecting you from getting sick and from going to the hospital. But they are showing at about six months — and, largely, this data comes out of Israel, that the vaccines are starting to fade in their protection.

So, the idea is that, if you're going to get a booster, you would be getting one more shot of the exact same vaccine you took originally. And that would extend your protection and ramp up your protection. The CEO of Pfizer recently said — this is Albert Bourla — he said that in studies in the — within the company themselves, a third dose boosted the protection by tenfold.

So, that's the rationales.

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