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Percentage of budgerigars with clinical signs observed in vaccinated and placebo-vaccinated groups from 6 to 20 days post challenge. Two groups were compared using the Fisher Exact test. Vaccinated birds suffered significantly (* p < 0.05) less from diarrhea than the birds who received the placebo vaccine. But, the number of the birds was too small for this test to compare the two groups fairly for each clinical sign.