Affiliation:
1. Department of Clinical Microbiology, Karolinska Hospital, S-10401 Stockholm, Sweden
2. Department of Bacteriology and Epizootology, College of Veterinary Medicine, Biomedicum, S-75123 Uppsala, Sweden
Abstract
The agglutination of erythrocytes from various animal species by
Escherichia coli
was studied. The 405 strains of
E. coli
were isolated from urine in patients with urinary tract infections, from blood in septicemic patients, or from feces in persons without intestinal or urinary disorders. In urinary tract infections,
d
-mannose-resistant agglutination (MRHA) of human erythrocytes was the most common finding (23% of the strains). The highest frequency of mannose-sensitive hemagglutination (MSHA) attributed to type I (common type) pili occurred with guinea pig erythrocytes (11.5%). Of the 78
E. coli
strains isolated from blood cultures, 11 (14%) produced MRHA of human erythrocytes and only one gave MSHA. In the stool cultures, only 1 of 170
E. coli
strains was MSHA reacting, whereas 28 strains (16.5%) showed MRHA of human erythrocytes. No MRHA strain reacted with antiserum against colonization factor antigen (CFA)/I of pilus nature in enterotoxigenic human
E. coli
strains (O78:H12). MRHA of bovine erythrocytes, reputedly typical of enterotoxigenic
E. coli
of serogroups O6 and O8, was shown by only two strains, neither of which agglutinated with CFA/II antiserum. The most common hemagglutinating pattern of
E. coli
from urine and blood thus was MRHA for human erythrocytes. This agglutination may have been caused by pili or other surface properties of one or more serotypes. These may represent a new class of colonization-promoting antigens (adhesins).
Publisher
American Society for Microbiology
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