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. 2024 Dec;48(6):3883-3888.
doi: 10.1007/s11259-024-10557-z. Epub 2024 Sep 27.

Detection of Shiga toxin-producing Escherichia coli in dairy cows: genetic characterization and inhibition of adherence by cattle anti-STEC antibodies to HEp-2 cell

Rocío Colello  1   2 , M Victoria Vélez  3   4 , Marcelo Rodríguez  5 , Ariel Rogé  6 , Analía I Etcheverría  1   2 , Nora Lía Padola  1   2
Affiliations

Detection of Shiga toxin-producing Escherichia coli in dairy cows: genetic characterization and inhibition of adherence by cattle anti-STEC antibodies to HEp-2 cell

Rocío Colello et al. Vet Res Commun. 2024 Dec.

Abstract

Shiga toxin-producing Escherichia coli (STEC) is a zoonotic pathogen associated with severe disease. Cattle are recognized as the primary animal reservoir of STEC. This study reports the occurrence and characterization of STEC from dairy cows and evaluates the inhibition of adherence by cattle anti-STEC antibodies to the HEp-2 cell. From 151 samples, 30% (n = 45) were positive for stx by PCR screening (25.21% of dairy cows and 46.8% of growing calves). From these positive samples, 17 STEC isolates were characterized. In dairy cows, 3 out of 17 samples carried stx2, 3 out of 17 possessed stx1, and 2 out of 17 carried stx1/stx2. In growing cows, 8 out of 17 samples carried stx1 and 1 out of 17 carried stx1/stx2. Other virulence factors such as ehxA, saa, iha, cah, and eae were detected. The strains were typed into 3 E. coli O groups (O26, O91, and O130). The analysis of the HEp-2 adherence assays indicated that all serum from both cattle categories presented high levels of inhibition of adherence. Considering the severity of the symptoms caused by STEC in humans, searching for factors influencing the colonization of STEC in cattle would help identify strategies to avoid transmission and STEC infection.

Keywords: Adherence; Antibodies; Dairy cows; HEp-2 cell; STEC.

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