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Effect of spectinomycin on Escherichia coli infection in 1-day-old ducklings.

Author(s): Freed M, Clarke JP, Bowersock TL, Van Alstine WG, Balog JM, Hester PY

Affiliation(s): Department of Animal Sciences, School of Agriculture, Purdue University, West Lafayette, Indiana 47907.

Publication date & source: 1993-07, Avian Dis., 37(3):763-6.

Publication type: Clinical Trial; Randomized Controlled Trial; Research Support, U.S. Gov't, Non-P.H.S.

Two challenge trials and one confirmation trial were conducted to evaluate the efficacy of spectinomycin in the treatment of 1-day-old ducklings infected with Escherichia coli. In the challenge trials, ducklings were injected in the right posterior thoracic air sac with 0.2 cm3 of broth containing 10(8) colony-forming units E. coli (strain O78, E38)/ml. Spectinomycin at dosage levels of 2.5 mg, 5.0 mg, and 10.0 mg of activity was injected subcutaneously 6 hours following infection. The confirmation trial was conducted to confirm the challenge trials; procedures were similar to those used in the challenge trials, except that only the 5.0 mg of activity dosage of spectinomycin was used. In both types of trials, spectinomycin-treated ducklings had significantly lower mortality and higher average weight gain, average daily gain, and feed consumption than infected unmedicated controls. These results indicate that spectinomycin is effective in treating ducks for experimentally induced colibacillosis caused by E. coli (strain O78, E38).

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