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Clinical and bacteriological specificities of Escherichia coli bloodstream infections from biliary portal of entries.
Journal of Infectious Diseases 2024 January 13
BACKGROUND: Escherichia coli is frequently responsible for bloodstream infections (BSI). Among digestive BSI, biliary infections appear to be less severe. Respective roles of host factors, bacterial determinants (phylogroups, virulence and antibiotic resistance) and portal of entry on outcome are unknown.
METHODS: Clinical characteristics and prognosis of 770 episodes of E. coli BSI were analyzed and isolates sequenced (Illumina technology) comparing phylogroups, MLST, virulence and resistance gene content. BSI isolates were compared with 362 commensal E. coli from healthy subjects.
RESULTS: Among 770 episodes, 135 were biliary, 156 non-biliary digestive and 479 urinary. Compared to urinary, BSI of digestive origin occurred significantly more in men, comorbid and immunocompromised patients. Digestive portal of entry was significantly associated with septic shock and death. Among digestive infections, patients with biliary infections were dies less (P=0.032), despite comparable initial severity. Biliary E. coli resembled commensals (phylogroup distribution, ST group and few virulence-associated genes) whereas non-biliary digestive and urinary strains carried many virulence-associated genes.
CONCLUSIONS: E. coli strains responsible for biliary infections exhibit commensal characteristics and are associatedd with lower mortality rates, despite similar initial severity than other digestive BSI. Biliary drainage in addition to antibiotics in the management of biliary infections may explain improved outcome.
METHODS: Clinical characteristics and prognosis of 770 episodes of E. coli BSI were analyzed and isolates sequenced (Illumina technology) comparing phylogroups, MLST, virulence and resistance gene content. BSI isolates were compared with 362 commensal E. coli from healthy subjects.
RESULTS: Among 770 episodes, 135 were biliary, 156 non-biliary digestive and 479 urinary. Compared to urinary, BSI of digestive origin occurred significantly more in men, comorbid and immunocompromised patients. Digestive portal of entry was significantly associated with septic shock and death. Among digestive infections, patients with biliary infections were dies less (P=0.032), despite comparable initial severity. Biliary E. coli resembled commensals (phylogroup distribution, ST group and few virulence-associated genes) whereas non-biliary digestive and urinary strains carried many virulence-associated genes.
CONCLUSIONS: E. coli strains responsible for biliary infections exhibit commensal characteristics and are associatedd with lower mortality rates, despite similar initial severity than other digestive BSI. Biliary drainage in addition to antibiotics in the management of biliary infections may explain improved outcome.
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