Mary Duenwald & Sam Fazeli, Columnists

I Got Vaccinated, Then I Got Covid. What Happened?

As good as even the most effective shots are, they can’t promise total immunity. A Bloomberg Opinion editor found that out the hard way.

Being vaccinated means you won’t get Covid, right? Not exactly.

Photographer: Go Nakamura/Bloomberg

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Mary Duenwald, a Bloomberg Opinion editor, tested positive for Covid-19 even after receiving both doses of the Pfizer Inc.-BioNTech SE vaccine. Here, she discusses her experience with Sam Fazeli, a pharmaceutical industry analyst for Bloomberg Intelligence. The conversation has been edited and condensed.

MD: I was vaccinated for Covid recently — I got my second Pfizer shot a few weeks ago. I was hoping that meant I wouldn’t get Covid, yet I tested positive this week. How is that possible?