Figure 1.

Effect of treatment with placebo or oral interferon alpha on cough, nasal discharge, nasopharyngeal exudate, and tracheal exudate score in young standardbreds with inflammatory airway disease receiving 1 week’s rest. Results are presented as mean and standard error of the mean. Significance (*P < 0.017, **P < 0.01, with P < 0.017 considered significant as a result of multiple comparison) refers to day 0 compared with day 6 and day 14 for each treatment group by the Wilcoxon Signed Ranks test. Treatment groups on each day were compared by the Kruskall-Wallis test, but there were no significant differences between the groups on any day.