The most prevalent HBV genotype is D (63.8%) followed by genotype A (10.0%), genotype C (7.7%) and genotype B (5.8%), while
untypable and mixed genotypes are 2.7% and 10%, respectively (Idrees et al., 2004; Noorali et al., 2008; Ahmed et al., 2009).
The STEC serogroups associated with human diseases are numerous which include O1, O2, O4, O5, O6, O22, O23, O26, O38, O45, O48, O50, O55, O73, O75, O91, O100, O103, O104, O105, O111, O113, O114, O115, O117, O118, O119, O121, O125, O126, O128, O132, O145, O153, O163, O165, and O166, as well as
untypable isolates [9].Consumption of contaminated food with these STEC strains is the main cause of human infections [10].