Sensitivity of test strategies used in the Voluntary Johne's Disease Herd Status Program for detection of Mycobacterium paratuberculosis infection in dairy cattle herds.

Objective: To evaluate sensitivities at the herd level of test strategies used in the Voluntary Johne's Disease Herd Status Program (VJDHSP) and alternative test strategies for detecting dairy cattle herds infected with Mycobacterium paratuberculosis.

Design: Nonrandom cross-sectional study.

Sample Population: 64 dairy herds from Pennsylvania, Minnesota, Colorado, Ohio, and Wisconsin.