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On Sept. 22, Taylor Swift made an unexpected announcement that she was releasing a new single called "Patient Zero." The news sent Swifties and music sleuths on a wild goose chase for online clues to the meaning of the song title. Meanwhile, those working in public health felt their hearts sink—they worried that Swift was breathing new life into the toxic term "patient zero," used since the 1980s to blame and scapegoat patients during infectious disease outbreaks.

But now that the song and star-studded music video have been released to the world, the parsed lyrics bring an unexpected conclusion: By changing its meaning, Swift may have helped to defang the term's toxicity.

To understand where the stigma associated with the phrase "patient zero" comes from, we need to go back to its accidental origin. In 1982, researchers at the U.S. Centers for Disease Control and Prevention (CDC) investigated reports of sexual links between several gay men with AIDS in California, some dating back several years. Contact tracing showed a network of sexual connections between these men and other gay men across North America.

The CDC researchers identified one man who stood out because of the number of past contacts he could recall. These numerous connections placed him at the visual center of the investigators' reconstructed network. They initially referred to him as "out of California," since he lived outside the state, calling him "patient o (oh)" as shorthand.

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