How Many Shots Does It Take?

In an interview with CBS News, Albert Bourla, the CEO of Pfizer, now says a fourth shot of his company’s product is necessary. https://www.independent.co.uk/news/world/americas/us-politics/pfizer-fourth-vaccine-albert-bourla-b2035615.html.) (See full transcript here: https://www.cbsnews.com/news/albert-bourla-face-the-nation-full-transcript-03-13-2022/.) Two months earlier, back in January, the Pfizer CEO was again speaking in his own cause, this time asserting that a third shot was necessary—and he …