Mechanical homogenization increases bacterial homogeneity in sputum.

Abstract:

:Sputum obtained from patients with cystic fibrosis (CF) is highly viscous and often heterogeneous in bacterial distribution. Adding dithiothreitol (DTT) is the standard method for liquefaction prior to processing sputum for molecular detection assays. To determine if DTT treatment homogenizes the bacterial distribution within sputum, we measured the difference in mean total bacterial abundance and abundance of Burkholderia multivorans between aliquots of DTT-treated sputum samples with and without a mechanical homogenization (MH) step using a high-speed dispersing element. Additionally, we measured the effect of MH on bacterial abundance. We found a significant difference between the mean bacterial abundances in aliquots that were subjected to only DTT treatment and those of the aliquots which included an MH step (all bacteria, P = 0.04; B. multivorans, P = 0.05). There was no significant effect of MH on bacterial abundance in sputum. Although our results are from a single CF patient, they indicate that mechanical homogenization increases the homogeneity of bacteria in sputum.

journal_name

J Clin Microbiol

authors

Stokell JR,Khan A,Steck TR

doi

10.1128/JCM.00487-14

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

2340-5

issue

7

eissn

0095-1137

issn

1098-660X

pii

JCM.00487-14

journal_volume

52

pub_type

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