Many septicemic Escherichia coli strains produce polysaccharide capsules, which are important for survival in serum. Here we show that a septicemic E. coli strain of serotype O78 produce an O-antigen capsule (group 4 capsule) and we show that this capsule is essential for serum survival.

中文翻译：

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大肠杆菌O抗原胶囊（第4组）对于血清抵抗力至关重要。

许多败血性大肠杆菌菌株会产生多糖胶囊，这对于在血清中存活很重要。在这里，我们显示了血清型为O78的败血性大肠杆菌菌株产生了O抗原胶囊（第4组胶囊），并且我们显示该胶囊对于血清存活至关重要。