Texas fever, two-headed calves and the Hatch Act--100 years and counting for veterinary parasitology in the United States.

The structure, historical development and major research problems confronting veterinary parasitology in the U.S.A. are reviewed 100 years after the cooperative federal-state experiment station system was authorized through passage of the Hatch Act by the U.S. Congress in 1887. The story of Texas cattle fever eradication from the American south exemplifies historical and functional aspects of the experiment station system. The distribution and importance of parasite problems of livestock, companion animals and parasitic zoonoses are summarized in the context of larger national agricultural issues.