Dr. Ozlem Tureci and Dr. Ugur Sahin, the co-founders of BioNTech, are behind the first coronavirus vaccine to be approved in the West. Starting next week, the “Pfizer vaccine” will be available in Britain.

While Pfizer is financing and distributing the vaccine, the science behind it was actually spearheaded by the couple’s lesser-known company. When Drs. Tureci and Sahin, along with their BioNTech team, embarked on this mission, the record for the fastest vaccine creation was four years. They did it in less than one.

BioNTech started working on a vaccine in January. By early November, the company shared the results of its Phase 3 trials: over 90 percent efficacy. The announcement was made days after the presidential election was called for Joe Biden, and Donald Trump claimed the timing was politically motivated.

In this episode of “Sway,” the couple dismiss that accusation and speak instead to the science. “Clinical trials are highly regulated,” Dr. Tureci says. “And this is something which you cannot really delay or stop or expedite.”

You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.

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