The U.S. Public Health Service · Episode 26 of 34 · 18 min
West Nile: The Virus America Never Cured (1999–2026)
In late summer 1999 an old-world virus arrived in New York the way plagues used to, with the dead: people in Queens fell ill with encephalitis and crows fell out of the sky. Bronx Zoo pathologist Tracey McNamara pushed until a federal animal lab named West Nile virus. The federal answer was a surveillance network and a screened blood supply, not a cure, and there is still no human vaccine.
Who's who
- Tracey McNamaraBronx Zoo pathologist who linked dying birds to the human outbreak
Where it happens
- Queens, New YorkWhere the 1999 human encephalitis cases appeared
- Bronx Zoo, New YorkWhere dying zoo birds helped crack the identification
- Ames, IowaSite of the federal animal laboratory that tested the birds
Timeline
- August 1999Encephalitis cluster appears in Queens, first diagnosed as St. Louis encephalitis
- September 1999West Nile virus identified, first in the Western Hemisphere
- 2000CDC stands up the ArboNET surveillance system
- June 14, 2003All U.S. blood donations screened for West Nile
- 2012All 48 contiguous states have reported a locally acquired human case
Still debated
Credit for solving the outbreak is shared across the zoo, USDA, CDC, and state labs, not McNamara alone. The initial St. Louis encephalitis diagnosis was a defensible read, and the absence of a human vaccine reflects market economics and limited push rather than failed science.