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2017 ; 64
(9
): 1163-1170
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gab.com Text
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Contribution to Clostridium Difficile Transmission of Symptomatic Patients With
Toxigenic Strains Who Are Fecal Toxin Negative
#MMPMID28158441
Mawer DPC
; Eyre DW
; Griffiths D
; Fawley WN
; Martin JSH
; Quan TP
; Peto TEA
; Crook DW
; Walker AS
; Wilcox MH
Clin Infect Dis
2017[May]; 64
(9
): 1163-1170
PMID28158441
show ga
BACKGROUND: The role of symptomatic patients who are toxigenic strain positive
(TS+) but fecal toxin negative (FT-) in transmission of Clostridium difficile is
currently unknown. METHODS: We investigated the contribution of symptomatic
TS+/FT- and TS+/FT+ patients in C. difficile transmission in 2 UK regions. From
2-step testing, all glutamate dehydrogenase (GDH)-positive specimens, regardless
of fecal toxin result, from Oxford (April 2012 through April 2013) and Leeds
(July 2012 through April 2013) microbiology laboratories underwent culture and
whole-genome sequencing (WGS), using WGS to identify toxigenic strains. Plausible
sources for each TS+/FT+ case, including TS+/FT- and TS+/FT+ patients, were
determined using WGS, with and without hospital admission data. RESULTS: A total
of 1447 of 12772 (11%) fecal samples were GDH positive, 866 of 1447 (60%)
contained toxigenic C. difficile, and fecal toxin was detected in 511 of 866
(59%), representing 235 Leeds and 191 Oxford TS+/FT+ cases. TS+/FT+ cases were 3
times more likely to be plausibly acquired from a previous TS+/FT+ case than a
TS+/FT- patient. Fifty-one of 265 (19%) TS+/FT+ cases diagnosed >3 months into
the study were genetically related (?2 single-nucleotide polymorphisms) to ?1
previous TS+/FT+ case or TS+/FT- patient: 27 (10%) to only TS+/FT+ cases, 9 (3%)
to only TS+/FT- patients, and 15 (6%) to both. Only 10 of 265 (4%) were
genetically related to a previous TS+/FT+ or TS+/FT- patient and shared the same
ward simultaneously or within 28 days. CONCLUSIONS: Symptomatic TS+/FT- patients
were a source of C. difficile transmission, although they accounted for less
onward transmission than TS+/FT+ cases. Although transmission from symptomatic
patients with either fecal toxin status accounted for a low overall proportion of
new cases, both groups should be infection control targets.