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Occurrence of hlyA and sheA Genes in Extraintestinal Escherichia coli Strains
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ABSTRACT
The association of a hemolytic phenotype with the carriage of the α-hemolysin gene (
hlyA
) and/or the silent hemolysin gene (
sheA
or
clyA
) among 540 extraintestinal clinical isolates of
Escherichia coli
and 110 fecal isolates from healthy individuals was investigated. Though HlyA is an important virulence factor in extraintestinal
E. coli
infection, the role of SheA is not completely clarified. Two hemolytic
sheA
+
E. coli
strains that lacked
hlyA
and possessed no other hemolysin genes were identified. No
hlyA
+
sheA
+
strains were identified, suggesting that there is possible incompatibility between
hlyA
and
sheA
in the chromosome of
E. coli
.
American Society for Microbiology
Title: Occurrence of
hlyA
and
sheA
Genes in Extraintestinal
Escherichia coli
Strains
Description:
ABSTRACT
The association of a hemolytic phenotype with the carriage of the α-hemolysin gene (
hlyA
) and/or the silent hemolysin gene (
sheA
or
clyA
) among 540 extraintestinal clinical isolates of
Escherichia coli
and 110 fecal isolates from healthy individuals was investigated.
Though HlyA is an important virulence factor in extraintestinal
E.
coli
infection, the role of SheA is not completely clarified.
Two hemolytic
sheA
+
E.
coli
strains that lacked
hlyA
and possessed no other hemolysin genes were identified.
No
hlyA
+
sheA
+
strains were identified, suggesting that there is possible incompatibility between
hlyA
and
sheA
in the chromosome of
E.
coli
.
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