BSE in the United States: Four Confirmed Cases (2003–2018)

As of January 2023, the US has confirmed 4 cases of BSE:

Year	State	Type	Details
2003	Washington	Classical (imported)	Canadian-born cow; detected via surveillance.
2005	Texas	Atypical (H-type)	12-year-old beef cow; no feed link.
2006	Alabama	Atypical (H-type)	10-year-old beef cow.
2012	California	Atypical (L-type)	10-year-old dairy cow; detected at rendering.
2018	Florida	Atypical (H-type)	6-year-old beef cow.

Key Points

• Only 1 classical case (imported); 4 atypical (spontaneous).
• US feed ban (1997, strengthened 2008) prohibits mammalian protein to ruminants.
• SRM removal, surveillance (~40,000 tests/year), traceability in place.
• OIE status: "Negligible BSE risk" since 2013.
• No vCJD cases acquired in US.

Ongoing vigilance for atypical BSE and CWD spillover.