INVESTIGADORES
LUCCHESI paula Maria Alejandra
artículos
Título:
First isolation of the enterohaemorrhagic Escherichia coli O145:H- from cattle in feedlot in Argentina
Autor/es:
PADOLA N. L.; SANZ, M.E.; LUCCHESI, P.M.A.; BLANCO, J. E.; BLANCO, J.; BLANCO, M.; ETCHEVERRÍA, A. I.; ARROYO, G.H.; PARMA, A.E.
Revista:
BMC MICROBIOLOGY
Editorial:
BIOMED CENTRAL LTD
Referencias:
Año: 2002 vol. 2 p. 6 - 8
ISSN:
1471-2180
Resumen:
Background: Enterohaemorrhagic Escherichia coli (EHEC) is considered to be common cause of
haemorrhagic colitis (HC), thrombotic thrombocytopenic purpura and haemolytic uraemic
syndrome (HUS) in humans. In a previous paper, we have demonstrated that EHEC are commonly
found in the intestines of livestock. Infections in humans are, in part, a consequence of consumption
of undercooked meat or raw milk. Argentina has one of the highest records of HUS (300400
cases/year; 22/100,000 children under 4 years of age). The aim of this work is to communicate the
first isolation of O145:H-from cattle in this country and characterize the virulence cassette,
providing useful information to evaluate the risk of foodborne transmission of this emergent non-
O157:H7 serotype.
haemorrhagic colitis (HC), thrombotic thrombocytopenic purpura and haemolytic uraemic
syndrome (HUS) in humans. In a previous paper, we have demonstrated that EHEC are commonly
found in the intestines of livestock. Infections in humans are, in part, a consequence of consumption
of undercooked meat or raw milk. Argentina has one of the highest records of HUS (300400
cases/year; 22/100,000 children under 4 years of age). The aim of this work is to communicate the
first isolation of O145:H-from cattle in this country and characterize the virulence cassette,
providing useful information to evaluate the risk of foodborne transmission of this emergent non-
O157:H7 serotype.
Enterohaemorrhagic Escherichia coli (EHEC) is considered to be common cause of
haemorrhagic colitis (HC), thrombotic thrombocytopenic purpura and haemolytic uraemic
syndrome (HUS) in humans. In a previous paper, we have demonstrated that EHEC are commonly
found in the intestines of livestock. Infections in humans are, in part, a consequence of consumption
of undercooked meat or raw milk. Argentina has one of the highest records of HUS (300400
cases/year; 22/100,000 children under 4 years of age). The aim of this work is to communicate the
first isolation of O145:H-from cattle in this country and characterize the virulence cassette,
providing useful information to evaluate the risk of foodborne transmission of this emergent non-
O157:H7 serotype.
Results: EHEC O145:H- was isolated from cattle in an Argentinian feedlot. Pheno- and genotype
of nine strains were characterized, corresponding to several virulence cassettes: VT2+eaeA+ Mp+
of nine strains were characterized, corresponding to several virulence cassettes: VT2+eaeA+ Mp+
EHEC O145:H- was isolated from cattle in an Argentinian feedlot. Pheno- and genotype
of nine strains were characterized, corresponding to several virulence cassettes: VT2+eaeA+ Mp++eaeA+ Mp+
(n = 5), VT2+eaeA+ (n = 1), VT1+eaeA+ Mp+ (n = 2), and VT1+eaeA+ (n = 1). Strains isolated from
the same animal were considered only when they showed a different virulence pattern. The clonal
relationship was studied by RAPD. Strains were distributed in two RAPD profiles, which
corresponded to the presence of either, VT1+ or VT2+ genotype. No difference was detected by
RAPD analysis between Mp+ or Mp- strains.
RAPD analysis between Mp+ or Mp- strains.
the same animal were considered only when they showed a different virulence pattern. The clonal
relationship was studied by RAPD. Strains were distributed in two RAPD profiles, which
corresponded to the presence of either, VT1+ or VT2+ genotype. No difference was detected by
RAPD analysis between Mp+ or Mp- strains.
RAPD analysis between Mp+ or Mp- strains.
+eaeA+ (n = 1), VT1+eaeA+ Mp+ (n = 2), and VT1+eaeA+ (n = 1). Strains isolated from
the same animal were considered only when they showed a different virulence pattern. The clonal
relationship was studied by RAPD. Strains were distributed in two RAPD profiles, which
corresponded to the presence of either, VT1+ or VT2+ genotype. No difference was detected by
RAPD analysis between Mp+ or Mp- strains.
RAPD analysis between Mp+ or Mp- strains.
+ or VT2+ genotype. No difference was detected by
RAPD analysis between Mp+ or Mp- strains.+ or Mp- strains.
Conclusions: This was the first isolation of EHEC O145:H- serotype in Argentina enlarging the
list of non-O157:H7 serotypes isolated from cattle in this country by us. All O145:H-strains carried
several virulence factors which allow us to predict their potential ability to develop haemolytic
uraemic syndrome in humans.
list of non-O157:H7 serotypes isolated from cattle in this country by us. All O145:H-strains carried
several virulence factors which allow us to predict their potential ability to develop haemolytic
uraemic syndrome in humans.
This was the first isolation of EHEC O145:H- serotype in Argentina enlarging the
list of non-O157:H7 serotypes isolated from cattle in this country by us. All O145:H-strains carried
several virulence factors which allow us to predict their potential ability to develop haemolytic
uraemic syndrome in humans.