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1 %) were the most common; three isolates were nontoxigenic.
3 results indicate that whereas both ETBF and nontoxigenic B. fragilis (NTBF) chronically colonize mic
6 the bft gene can be transferred from ETBF to nontoxigenic B. fragilis strains by a mechanism similar
8 were therefore used to test the ability of a nontoxigenic C-terminal domain (CTD) fragment of TcdB to
9 is prevented in hamsters by colonization by nontoxigenic C. difficile after administration of clinda
10 t observed when HIOs were colonized with the nontoxigenic C. difficile strain F200, we directly teste
12 ent with antibiotics, we gave a Cm-resistant nontoxigenic C. difficile strain, M13 (minimal inhibitor
13 cting alterations within both, toxigenic and nontoxigenic C. difficile strains after vancomycin treat
16 no cross-reactions with other enterotoxins, nontoxigenic C. difficile, or other Clostridum species.
17 Since culture is tedious and also detects nontoxigenic C. difficile, we conclude that culture is m
22 genic Corynebacterium diphtheriae strains, 9 nontoxigenic C. diphtheriae strains, and 44 strains repr
23 were infected with toxigenic cag-positive or nontoxigenic cag-negative strains of H. pylori or isogen
25 to test the efficacy of colonization with 3 nontoxigenic CD strains for preventing CDAD after exposu
30 l loss of the additional copies of rstC, the nontoxigenic derivatives can act as precursors of new to
32 ve humidity (30%), culturable amounts of the nontoxigenic E. coli O157:H7 strain ATCC 700728 and the
33 ed pathogenic E. coli, but it is absent from nontoxigenic E. coli O55:H7, sorbitol-fermenting Stx-pro
35 hat involved enterotoxin genes cloned into a nontoxigenic fimbriated strain have suggested that LT bu
37 cific antisera or active immunization with a nontoxigenic form of Hla significantly reduced the size
40 ffers dramatically from the host response to nontoxigenic infection or vaccination, where neutrophils
41 cholera toxin-producing strains, similar to nontoxigenic infection, accessory toxins are critical to
43 is highly stable in toxigenic C. difficile, nontoxigenic isolates lack the unit, and isolates with a
47 A3R (pXO1(+) pXO2(-)) and the totally cured, nontoxigenic, nonencapsulated RA3:00 (pXO1(-) pXO2(-)).
50 of steps from O55:H7, a recent ancestor of a nontoxigenic pathogenic clone associated with infantile
53 e report a bloodstream infection caused by a nontoxigenic strain of C. diphtheriae and discuss the ep
56 0 was replaced with the s2 sequence from the nontoxigenic strain Tx30a) or a VacA mutant protein (Vac
57 s.c. B. anthracis infection (an encapsulated nontoxigenic strain), we show that concomitant administr
58 l recruitment compared to mice infected with nontoxigenic strains and neutrophil depletion prior to i
59 ate that, if lysogenised by a bacteriophage, nontoxigenic strains circulating in the United Kingdom c
61 ated in the United Kingdom during 1995 and 4 nontoxigenic strains isolated in other countries were an
62 ants of the predicted DtxR protein among the nontoxigenic strains isolated in the United Kingdom.
64 from patients infected with VacA(+), but not nontoxigenic strains of H pylori, had increased levels o
65 ere infected with cag(+) toxigenic or cag(-) nontoxigenic strains of H. pylori or isogenic mutants.
66 The expression of fpn by both toxigenic and nontoxigenic strains suggests that this protease may con
71 echanism of cholera toxin gene transfer into nontoxigenic V. cholerae isolates, including strains tha
72 e report two unassociated cases of nonfatal, nontoxigenic V. cholerae non-O1, non-O139 bacteremia in
74 -T1ts can replicate and integrate into these nontoxigenic V. cholerae strains with high efficiency.
75 ked derivative of the CTX prophage into four nontoxigenic V. cholerae strains, including two V. chole
76 ted with wild-type ETBF (WT-ETBF) strains, a nontoxigenic WT strain of B. fragilis (WT-NTBF), WT-NTBF
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