50% Lethal Time (LT50) of Caenorhabditis elegans infected by the E. coli ST131 strains and non-ST131 strains.

The results are representative of at least five independent trials for each group of strains. p: Pairwise comparison using a log rank tests. NS: non significant.各组菌株的实验结果均至少基于五次独立重复试验，具有代表性。p值：采用对数秩检验（log rank test）进行两两比较。NS：无统计学意义。