Pathogens, doses, and animals.

NA = not applicable.
1The pilot study was conducted in summer 2011. The optimized study was conducted in summer 2012.
2California Animal Health and Food Safety Laboratory, clinical isolate.
3Euthanized early, tissues not sampled.
4For each pathogen in the optimized study there were 4 control steers for clinical sign analysis (a total of 24 steers); these were not necropsied. Tissue samples and pathology data was obtained from 3 additional numbered viral controls and 3 additional bacterial controls.
Pathogens, doses, and animals.

注：NA 意为不适用（not applicable）。
1. 本预实验于2011年夏季开展，优化后的实验于2012年夏季实施。
2. 加利福尼亚动物健康与食品安全实验室（California Animal Health and Food Safety Laboratory）的临床分离株。
3. 受试个体于早期被实施安乐死，未采集组织样本。
4. 在优化后的实验中，针对每种病原体，均设置4头对照肉牛用于临床症状分析（总计24头肉牛），此类对照牛未进行剖检。另有额外的3株编号病毒对照与3株编号细菌对照，其组织样本及病理学数据均已获取。
病原体、感染剂量与受试动物