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<ns4:p><ns4:bold>Background:</ns4:bold> We have previously shown that PCR following enrichment culture is the most sensitive method to detect <ns4:italic>Burkholderia pseudomallei</ns4:italic> in environmental samples. Here we report an evaluation of the published consensus method for the culture of <ns4:italic>B. pseudomallei</ns4:italic> from Lao soil in comparison with our conventional culture method and with PCR with or without prior broth enrichment.</ns4:p><ns4:p> <ns4:bold>Methods:</ns4:bold> One hundred soil samples were collected from a field known to contain <ns4:italic>B. pseudomallei </ns4:italic>and processed by: (i) the conventional method, (ii-iii) the consensus method using media prepared in either Laos or Thailand, and (iv) the consensus method performed in Thailand, as well as by (v) PCR following direct extraction of DNA from soil and (vi) PCR following broth pre-enrichment.</ns4:p><ns4:p> <ns4:bold>Results:</ns4:bold> The numbers of samples in which <ns4:italic>B. pseudomallei</ns4:italic> was detected were 42, 10, 7, 6, 6 and 84, respectively. However, two samples were positive by the consensus method but negative by conventional culture, and one sample was negative by PCR following enrichment although <ns4:italic>B. pseudomallei</ns4:italic> was isolated by the conventional culture method.</ns4:p><ns4:p> <ns4:bold>Conclusions/Discussion:</ns4:bold> The results show that no single method will detect all environmental samples that contain <ns4:italic>B. pseudomallei.</ns4:italic> People conducting environmental surveys for this organism should be aware of the possibility of false-negative results using the consensus culture method. An approach that entails screening using PCR after enrichment, followed by the evaluation of a range of different culture methods on PCR-positive samples to determine which works best in each setting, is recommended.</ns4:p>

Original publication

DOI

10.12688/wellcomeopenres.14851.1

Type

Journal article

Journal

Wellcome Open Research

Publisher

F1000 ( Faculty of 1000 Ltd)

Publication Date

15/10/2018

Volume

3

Pages

132 - 132