Bildfell R J, Eltzroth E K, Songer J G
Veterinary Diagnostic Laboratory, Oregon State University, Corvallis 97331, USA.
Avian Dis. 2001 Jul-Sep;45(3):760-3.
Increased mortalities in adult western bluebirds utilizing nestboxes were noted in western Oregon during 1998 and 1999. A necrohemorrhagic enteritis was found in 8 of 10 birds submitted for necropsy. Acanthocephalan parasites were present in four of eight birds with enteritis. Microscopic changes consistent with necrotic or ulcerative enteritis were commonly present. Anaerobic culture of the intestine yielded Clostridium perfringens in three of three birds. Genotype analysis of two of these isolates revealed them to be C. perfringens type A. Bacterial enteritis is believed to be the cause of the increased mortality rate, but further investigation is required to prove a definitive link to a clostridial agent.
1998年和1999年期间，在俄勒冈州西部，人们注意到使用巢箱的成年西部蓝鸲死亡率有所上升。在送检尸检的10只鸟中，有8只发现了坏死性出血性肠炎。8只患有肠炎的鸟中有4只体内存在棘头虫寄生虫。通常可见与坏死性或溃疡性肠炎相符的微观变化。对三只鸟的肠道进行厌氧培养，三只均培养出产气荚膜梭菌。对其中两个分离株进行基因型分析，结果显示它们属于A型产气荚膜梭菌。细菌性肠炎被认为是死亡率上升的原因，但需要进一步调查以证实与梭菌病原体的明确关联。
