Taylor Swift’s “Patient Zero,” released September 25 as the lead single from the four-track *The Life of a Showgirl: The Encore* expansion of her record-shattering 2025 album, opened with immediate streaming dominance. The track set Spotify’s single-day record for the most-streamed song by a female artist in 2026 so far, while Swift herself became the platform’s most-streamed female artist that day, building on the original album’s historic first-week performance exceeding 4 million U.S. equivalent units. Pre-release hype from weeks of Easter eggs, a website countdown, limited-edition CD variants, and Swift’s collaboration with Max Martin and Shellback fueled fan mobilization, mirroring the trajectory of prior singles like “The Fate of Ophelia,” which logged nearly 129 million first-week Spotify streams. The cinematic music video, directed by Swift and starring Dakota Johnson and Colin Farrell, premieres at the September 27 VMAs, providing a key mid-week catalyst. Traders are weighing these factors against typical first-week decay patterns and competition from ongoing catalog streams when assessing whether “Patient Zero” sustains or accelerates its launch momentum through the charting window.