What does it take to cause a disease outbreak?If a disease agent such as the bacterium Aeromonas salmonicida and a susceptible host, such as the brook trout (Sa/ve/inusfontinalis), or the brown trout {Salmo trutta) are in proximity to one another in the same rearing unit, or the same stream, is disease inevitable? Are there other factors involved that can influence whether or not a disease outbreak occurs when a disease agent and a potentially susceptible host are in the same water?
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机译：如果导致疾病暴发的原因是什么？如果病原体如鲑鱼气单胞菌和易感宿主如溪鳟（Sa / ve / inusfontinalis）或褐鳟（Salmo trutta）靠近在相同的饲养单元或相同的溪流中相互争夺是不可避免的吗？当病原体和潜在易感宿主在同一水中时，是否还有其他因素会影响疾病爆发？
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