这样的雏鸡自出雏之日起，就受到被水平感染的威胁。
These chicks are at great risk from horizontal infection from hatching onwards.
斯托蒙特实验室的卓越工作，让我们对无明显临床症状的水平感染的影响有了更高层次的认识，并实现了对这些影响水平传染因素的量化分析。
Some excellent work at the Stormont laboratory has helped to highlight and quantify the effects of this horizontal infection in what might otherwise be considered "clinically normal" broilers.
人们早就知道，在感染期间，动物的血清铁水平会下降。
It has long been known that the level of serum iron in animals falls during infection.
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