{'fraction_non_alphanumeric': 0.020054694621695533, 'fraction_numerical': 0.007292616226071103, 'mean_word_length': 5.8625, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Intestinal colonization and adhesion by enteroxigenic Escherichia coli: ultrastructural observations on adherence to ileal epithelium of the pig.

Colonization of pig ileum by enterotoxigenic Escherichia coli that were enteropathogenic for pigs but that lacked K88 antigen (K88-) resulted in morphological characteristics similar to those reported for K88+ strains. Strains of enterotoxigenic E. coli from three different K88-serotypes adhered to the villous epithelium. In sections examined by transmission electron microscopy, adherent bacteria were separated from each other and from epithelial microvilli by peribacterial electron-lucent regions. The enterotoxigenic E. coli had appendages that extended into these regions. The appendages were morphologically characteristic for each strain. It is possible that these appendages were pili, polysaccharide K antigens, or structures resulting from some interaction between pili and polysaccharide. Certain pili or pilus-like structures may be virulence attributes that facilitate adhesion of enterotoxigenic E. coli to the intestinal epithelium.