Virulence Profiles and Antimicrobial Resistance of Streptococcus agalactiae Infective and Colonizing Strains from Argentina.

Streptococcus agalactiae (GBS) is a colonizing agent in pregnant women, the main cause of invasive neonatal infections, and the reason of serious diseases in non-pregnant adults. Several virulence determinants are involved in the pathogenesis. These include capsular polysaccharide, surface-localized proteins, and toxins.

Genetic features of verotoxigenic Escherichia coli O157:H7 isolated from clinical cases of Argentina and Chile.

We aimed to compare the genetic diversity existing in VTEC O157:H7 strains isolated from cases of human disease from Argentina and Chile. For it, 76 strains were studied in relation to the distribution of genes encoding virulence factors and subtyped by lineage-specific polymorphisms (LSPA-6), and phylogroups assignment. Our results show the almost exclusive circulation of VTEC O157:H7 isolates belonging to lineage I/II, associated with hypervirulent strains, and to the phylogroup E and, on the other hand, genetic diversity present among Argentinean and Chilean strains analyzed, mainly in relation to putative virulence determinants and nle profiles.

Multidrug Resistance and Molecular Characterization of Isolates From Dairy Cattle With Mastitis.

is a pathogen-associated to bovine mastitis, a health disorder responsible for significant economic losses in the dairy industry. Antimicrobial therapy remains the main strategy for the control of this bacterium in dairy herds and human In order to get insight on molecular characteristics of  strains circulating among Argentinean cattle with mastitis, we received 1500 samples from 56 dairy farms between 2016 and 2019. We recovered 56 isolates and characterized them in relation to serotypes, virulence genes, and antimicrobial susceptibility.

Draft Genome Sequence of Streptococcus agalactiae TA B490, a Multidrug-Resistant Strain Isolated from Bovine Mastitis in Argentina.

is a bovine pathogen that causes intramammary infections. For humans, is a leading cause of neonatal death and an emerging pathogen in adults. Here, we present the draft genome sequence of TA B490, a multidrug-resistant strain isolated from bovine mastitis in Argentina.

Differential expression of the virulence gene among Shiga toxin-producing strains.

Shiga toxin-producing (STEC) is a zoonotic foodborne pathogen associated with hemolytic uremic syndrome (HUS) that vary in their ability to cause disease in humans. STEC represents a serious problem for public health and Argentina is the country with the highest HUS incidence worldwide. Non-LEE effector () genes, present on pathogenicity islands (PAIs), encode translocated substrates of the type III secretion system (T3SS), which could have an important role in STEC virulence.