Tellurite Resistance in Shiga Toxin-Producing Escherichia coli.

Title Tellurite Resistance in Shiga Toxin-Producing Escherichia coli.
Authors G.L. Lewis; Q.R. Jorgensen; J.D. Loy; R.A. Moxley
Journal Curr Microbiol
DOI 10.1007/s00284-018-1444-x

Potassium tellurite (KTeO) 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 KTeO 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 KTeO 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??O26?>?O145?>?O157?>?O103?>?O121?=?O45. The KTeO geometric mean MIC was significantly higher in terD+ than in terD- STEC, but not in terD+ versus terD- control strains. Resistance to KTeO (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 KTeO 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 KTeO resistance than O26, O111, and O145 STEC.

Citation G.L. Lewis; Q.R. Jorgensen; J.D. Loy; R.A. Moxley.Tellurite Resistance in Shiga Toxin-Producing Escherichia coli.. Curr Microbiol. 2018;75(6):752759. doi:10.1007/s00284-018-1444-x

Related Elements


See more Tellurium products. Tellurium (atomic symbol: Te, atomic number: 52) is a Block P, Group 16, Period 5 element with an atomic radius of 127.60. Tellurium Bohr ModelThe number of electrons in each of tellurium's shells is 2, 8, 18, 18, 6 and its electron configuration is [Kr] 4d10 5s2 5p4. Tellurium was discovered by Franz Muller von Reichenstein in 1782 and first isolated by Martin Heinrich Klaproth in 1798. In its elemental form, tellurium has a silvery lustrous gray appearance. The tellurium atom has a radius of 140 pm and a Van der Waals radius of 206 pm. Elemental TelluriumTellurium is most commonly sourced from the anode sludges produced as a byproduct of copper refining. The name Tellurium originates from the Greek word Tellus, meaning Earth.

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