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1 %) were the most common; three isolates were nontoxigenic.
2 eaction was used to analyze 50 toxigenic, 39 nontoxigenic, and 2 toxin-defective isolates.
3  results indicate that whereas both ETBF and nontoxigenic B. fragilis (NTBF) chronically colonize mic
4            Studying a collection of ETBF and nontoxigenic B. fragilis (NTBF) strains, we found that b
5          Strains that do not secrete BFT are nontoxigenic B. fragilis (NTBF), and those that do are c
6 the bft gene can be transferred from ETBF to nontoxigenic B. fragilis strains by a mechanism similar
7 inal tract increases cytokine activity, with nontoxigenic bacteria (nontoxigenic Bacteroides fragilis
8 ly for C. difficile common antigen contained nontoxigenic bacteria.
9 tokine activity, with nontoxigenic bacteria (nontoxigenic Bacteroides fragilis) triggering a stronger
10                           Both toxigenic and nontoxigenic C difficile strains were selected for whole
11           Rates of detection of toxigenic or nontoxigenic C difficile were greatest among infants age
12 were therefore used to test the ability of a nontoxigenic C-terminal domain (CTD) fragment of TcdB to
13  is prevented in hamsters by colonization by nontoxigenic C. difficile after administration of clinda
14 t observed when HIOs were colonized with the nontoxigenic C. difficile strain F200, we directly teste
15                                              Nontoxigenic C. difficile strain M3 colonized the gastro
16 ent with antibiotics, we gave a Cm-resistant nontoxigenic C. difficile strain, M13 (minimal inhibitor
17 cting alterations within both, toxigenic and nontoxigenic C. difficile strains after vancomycin treat
18      Furthermore, simultaneous monitoring of nontoxigenic C. difficile strains is not possible, due t
19          The benefits of use of Cm-resistant nontoxigenic C. difficile to prevent CDAD must be balanc
20  no cross-reactions with other enterotoxins, nontoxigenic C. difficile, or other Clostridum species.
21    Since culture is tedious and also detects nontoxigenic C. difficile, we conclude that culture is m
22 oxigenic C. difficile (TCD), and 15 (6%) had nontoxigenic C. difficile.
23  phenotypic testing classified the strain as nontoxigenic C. diphtheriae biotype Gravis.
24 g these 14 cases, 1 was toxigenic and 3 were nontoxigenic C. diphtheriae by culture and Elek, 6 were
25         We studied the predominant strain of nontoxigenic C. diphtheriae circulating in the United Ki
26                                A total of 26 nontoxigenic C. diphtheriae strains isolated in the Unit
27 genic Corynebacterium diphtheriae strains, 9 nontoxigenic C. diphtheriae strains, and 44 strains repr
28 were infected with toxigenic cag-positive or nontoxigenic cag-negative strains of H. pylori or isogen
29       Groups of 10 hamsters were given 10(6) nontoxigenic CD spores 2 days after receiving a single d
30  to test the efficacy of colonization with 3 nontoxigenic CD strains for preventing CDAD after exposu
31                            Colonization with nontoxigenic CD strains is highly effective in preventin
32 associated with failure of colonization with nontoxigenic CD.
33  effect of rationally defined nonpathogenic, nontoxigenic, commensal strains of Clostridia on prevent
34                                              Nontoxigenic Corynebacterium diphtheriae and Corynebacte
35                                              Nontoxigenic Corynebacterium diphtheriae, often associat
36 ation of the resident CTX prophage-producing nontoxigenic derivatives at a high frequency.
37 l loss of the additional copies of rstC, the nontoxigenic derivatives can act as precursors of new to
38              rfbE(EcO157:H7) is conserved in nontoxigenic E. coli O157 strains expressing a variety o
39 ve humidity (30%), culturable amounts of the nontoxigenic E. coli O157:H7 strain ATCC 700728 and the
40 ed pathogenic E. coli, but it is absent from nontoxigenic E. coli O55:H7, sorbitol-fermenting Stx-pro
41                                              Nontoxigenic El Tor O1 V. cholerae infection is characte
42 ith 382 LD(50) of B. anthracis spores from a nontoxigenic encapsulated strain were completely protect
43 to regulate biofilm and type VI secretion in nontoxigenic environmental isolates.
44 hat involved enterotoxin genes cloned into a nontoxigenic fimbriated strain have suggested that LT bu
45 ulture cytotoxicity assay and were therefore nontoxigenic for diagnostic purposes.
46 cific antisera or active immunization with a nontoxigenic form of Hla significantly reduced the size
47                     Active immunization with nontoxigenic Hla(H35L) or passive immunization with neut
48              These isolates were found to be nontoxigenic in the Vero cell tissue culture cytotoxicit
49 ffers dramatically from the host response to nontoxigenic infection or vaccination, where neutrophils
50  cholera toxin-producing strains, similar to nontoxigenic infection, accessory toxins are critical to
51 lonized with either toxigenic H. pylori or a nontoxigenic isogenic mutant.
52  is highly stable in toxigenic C. difficile, nontoxigenic isolates lack the unit, and isolates with a
53 bacterium isolates, representing 5.9% of 494 nontoxigenic isolates tested, were detected by RT-PCR.
54 toxigenic isolates; these were absent in the nontoxigenic isolates.
55 those of the Elek test: 87 toxigenic and 158 nontoxigenic isolates.
56 in the ecology of strains, like toxigenic vs nontoxigenic Microcystis, including allelopathic and Bla
57 is was greatly reduced in mice infected with nontoxigenic mutants.
58 A3R (pXO1(+) pXO2(-)) and the totally cured, nontoxigenic, nonencapsulated RA3:00 (pXO1(-) pXO2(-)).
59                                Consistently, nontoxigenic or toxigenic isolates that lack one, two, o
60                                Toxigenic and nontoxigenic P. multocida isolates cannot be differentia
61 of steps from O55:H7, a recent ancestor of a nontoxigenic pathogenic clone associated with infantile
62                  These findings suggest that nontoxigenic precursors of the two V. cholerae O1 biotyp
63                                              Nontoxigenic protein A (SpA(KKAA)), when used as an immu
64 actionable understanding of toxigenic versus nontoxigenic strain ecology and toxin production.
65 e report a bloodstream infection caused by a nontoxigenic strain of C. diphtheriae and discuss the ep
66                                         Each nontoxigenic strain prevented disease in 87%-97% of hams
67 Clostridium difficile strain CD37, the first nontoxigenic strain sequenced.
68  Erie suggest that the observed toxigenic-to-nontoxigenic strain succession during the 2014 Toledo dr
69 0 was replaced with the s2 sequence from the nontoxigenic strain Tx30a) or a VacA mutant protein (Vac
70 s.c. B. anthracis infection (an encapsulated nontoxigenic strain), we show that concomitant administr
71 l recruitment compared to mice infected with nontoxigenic strains and neutrophil depletion prior to i
72 ate that, if lysogenised by a bacteriophage, nontoxigenic strains circulating in the United Kingdom c
73             The site of integration in three nontoxigenic strains contained a 17-bp GC-rich sequence
74 ated in the United Kingdom during 1995 and 4 nontoxigenic strains isolated in other countries were an
75 ants of the predicted DtxR protein among the nontoxigenic strains isolated in the United Kingdom.
76 outcomes included prevalence of toxigenic vs nontoxigenic strains of C difficile and prevalence of C
77                                              Nontoxigenic strains of Corynebacterium diphtheriae repr
78 from patients infected with VacA(+), but not nontoxigenic strains of H pylori, had increased levels o
79 ere infected with cag(+) toxigenic or cag(-) nontoxigenic strains of H. pylori or isogenic mutants.
80 eriophage, a process by which CTXphi infects nontoxigenic strains of V. cholerae.
81  The expression of fpn by both toxigenic and nontoxigenic strains suggests that this protease may con
82                    Ten of the phenotypically nontoxigenic strains were found to contain fragment A of
83 pensity to filament among both toxigenic and nontoxigenic strains.
84 atients infected with toxigenic (VacA(+)) or nontoxigenic strains.
85  epidemic and pandemic strains but absent in nontoxigenic strains.
86  rapid differentiation between toxigenic and nontoxigenic strains.
87                                              Nontoxigenic tox-bearing (NTTB) Corynebacterium isolates
88 echanism of cholera toxin gene transfer into nontoxigenic V. cholerae isolates, including strains tha
89 e report two unassociated cases of nonfatal, nontoxigenic V. cholerae non-O1, non-O139 bacteremia in
90                           A library of 8,734 nontoxigenic V. cholerae strains carrying transcriptiona
91 -T1ts can replicate and integrate into these nontoxigenic V. cholerae strains with high efficiency.
92 ked derivative of the CTX prophage into four nontoxigenic V. cholerae strains, including two V. chole
93 ted with wild-type ETBF (WT-ETBF) strains, a nontoxigenic WT strain of B. fragilis (WT-NTBF), WT-NTBF