What we know about 'Patient Zero,' Taylor Swift's newest single and music video

WASHINGTON — The teaser trailer for Taylor Swift's "Patient Zero" music video dropped Thursday morning, Sept. 24, piling on the anticipation for the latest release from the singer. 

Swift's Instagram post for the video amassed nearly 800,000 likes within a half-hour of its release, proving, once again, that the dominant pop star has mastered the art of keeping her fans in suspense and leaving clues for Swifties to unpack. Even the length of the short video, 13 seconds, takes on a special significance for fans who know Swift's favorite number.