Detection of plasma anti-lipopolysaccharide (LPS) antibodies against enterohemorrhagic E. coli(EHEC) in asymptomatic kindergarten teachers from Buenos Aires province

•Fifty-one percent of teachers had circulating antibodies against O157, O145, O121 and O103 LPS.•Anti-O157 antibodies were the most abundant found in 43% of the samples.•Twenty-one of the samples reacted against more than one LPS serotype.•Twenty percent showed IgM antibodies against at least one LPS serotype.•Continuous educational programs could help to reduce cases of HUS.