An enzyme-linked immunosorbent assay for detection of Bordetella avium infection in turkey flocks: sensitivity, specificity, and reproducibility.

An enzyme-linked immunosorbent assay (ELISA) for detection of Bordetella avium infection in turkey poults was developed. One-week-old poults challenged intratracheally with 10(12) colony-forming units of B. avium had detectable titers (greater than or equal to 11), with an average of 13.6% positive samples when the birds were 6 to 11 weeks old. The method was sensitive enough to detect maternal antibodies to B. avium in poults up to 3 weeks of age. The same poults challenged at 1 week of age had 100% tracheal infection up to 3 weeks of age, which dropped to 0% by 6 weeks. The method resulted in no false-positive samples (titer = 0) from birds not infected with B. avium and tested weekly between 4 and 11 weeks of age. Antibodies in turkey flocks infected with Newcastle disease virus, hemorrhagic enteritis virus, and Mycoplasma meleagridis, and birds infected with Escherichia coli had no apparent cross-reactivity to the B. avium antigens used in the ELISA. The percentages of B. avium-positive serum samples collected from different turkey flocks did not significantly differ (P greater than 0.05) when samples were tested by the developed ELISA at different times, an indication of the reproducibility of the method.