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- W1982151824 abstract "Escherichia coli strains that cause septicemia of poultry often possess F1 (type 1) fimbriae (encoded by pil [fim] homologous gene clusters) and/or P fimbriae (encoded by pap homologous gene clusters). These fimbriae are thought to be involved in infection and colonization. To study the dynamics of infection due to E. coli with different virulence determinant profiles and to examine the expression of these fimbriae in vivo, three pathogenic E. coli isolates--O1 (pil+/pap+), O2 (pil+/pap), and O78 (pil+/pap+)--were administered intratracheally to 1.5-week-old chickens. Chickens were euthanatized from 3 to 144 hr after infection. The three isolates caused lesions in 30 to 55% of birds. Colonization rates of the trachea, lungs, internal organs, and pericardial fluid were similar for all three isolates, whereas significant differences among isolates were observed in colonization of the air sacs and blood. Bacteria appeared rapidly in the blood, liver, and spleen, whereas presence in the pericardial fluid generally occurred only after 24 hr postinoculation. The dynamics of colonization of the air sacs varied among isolates. Immunofluorescence of frozen tissue sections demonstrated F1 fimbriae (pil expressed) but not P fimbriae on all three isolates colonizing the trachea and on the O1 and O78 isolates colonizing the air sacs. Results suggest that F1 fimbriae are involved in the early stages of development of colisepticemia by promoting association of pathogenic E. coli with the trachea and air sacs of chickens." @default.
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- W1982151824 date "1994-04-01" @default.
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- W1982151824 title "Bacterial Colonization and in vivo Expression of F1 (Type 1) Fimbrial Antigens in Chickens Experimentally Infected with Pathogenic Escherichia coli" @default.
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- W1982151824 doi "https://doi.org/10.2307/1591942" @default.
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