Abstract：
:Potassium tellurite (K2TeO3) is an effective selective agent for O157:H7 Shiga toxin-producing Escherichia coli (STEC), whereas tellurite resistance in non-O157 STEC is variable with information on O45 minimal. High-level K2TeO3 resistance in STEC is attributable to the ter gene cluster with terD an indicator of the cluster's presence. Polymerase chain reactions for terD and K2TeO3 minimum inhibitory concentration (MIC) determinations in broth cultures were conducted on 70 STEC and 40 non-STEC control organisms. Sixty-six STEC strains (94.3%) were terD+ compared to 28 control organisms (70.0%; P < 0.001). The prevalence of terD in O103 STEC strains was 70%, whereas in all other serogroups it was ≥ 90%. The K2TeO3 geometric mean MIC ranking for STEC serogroups from highest to lowest was O111 > O26 > O145 > O157 > O103 > O121 = O45. The K2TeO3 geometric mean MIC was significantly higher in terD+ than in terD- STEC, but not in terD+ versus terD- control strains. Resistance to K2TeO3 (MIC ≥ 25 mg/L) was exhibited by 65/66 terD+ and 0/4 terD- STEC strains, compared to 12/28 terD+ and 8/12 terD- control strains. These results confirm previous studies showing the significantly higher prevalence of the ter gene cluster in STEC strains, and the relationship between these genes and K2TeO3 resistance in STEC and especially intimin (eae)-positive STEC, in contrast to non-STEC organisms. O45 and O121 STEC, although frequently terD positive, on average had significantly lower levels of K2TeO3 resistance than O26, O111, and O145 STEC.
journal_name
Curr Microbioljournal_title
Current microbiologyauthors
Lewis GL,Jorgensen QR,Loy JD,Moxley RAdoi
10.1007/s00284-018-1444-xsubject
Has Abstractpub_date
2018-06-01 00:00:00pages
752-759issue
6eissn
0343-8651issn
1432-0991pii
10.1007/s00284-018-1444-xjournal_volume
75pub_type
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