Filmed over the course of the 2018-2019 flu season, “Pandemic” is full of what-if scenarios — many involving Madad’s work in New York City — that have now come to fruition. Minutes into the first episode, a team of medical workers covered head to toe in protective gear run through a simulation to test their readiness for a major flu outbreak in the city. Madad, who is overseeing the drill, warns them: “If you’re not protected, if you can’t protect yourself, then how are you going to protect others?” Later, she lays out a hypothetical scenario in which a single traveler arriving by plane in New York City could trigger an overwhelming outbreak that would, within weeks, incapacitate the city. She’s also seen pleading with politicians about resources for pandemic preparedness.