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Giardiasis and infections with Dientamoeba fragilis.
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Transfer of antibiotic resistance from animal and human strains of Escherichia coli to resident E. coli in the alimentary tract of man.
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Resistant Shigella dysenteriae.
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Effect of Helicobacter pylori eradication on G-cell and D-cell density in children.
Helicobacter pylori infection is associated with abnormalities in serum gastrin concentration, antral gastrin and somatostatin content, and D-cell density in adults. We have studied the effects of H pylori infection in children. We studied 13 children positive for H pylori and 7 negative children. The median antral somatostatin content was significantly lower in the positive than in the negative group (0.69 [range 0.35-0.91] vs 1.31 [0.73-1.67] ng/mg, p = 0.007). Both antral and serum gastrin concentrations were significantly higher in the positive group (30.1 [15.3-83.6] vs 14.8 [13.8-28.8] ng/mg, p = 0.008; and 89.9 [59.4-313.2] vs 29.5 [13.9-71.1] pg/mL, p = 0.006). Treatment to eradicate H pylori was successful in 11 of the 13 positive patients. With eradication antral somatostatin increased to within the normal range (by a median of 0.41 [0.21-0.86] ng/mg to 1.10 [0.81-1.55] ng/mg, p = 0.016). Serum and antral gastrin decreased (by 37.1 [5.5-265.2] pg/mL to 52.8 [21.4-267.5] ng/mg, p = 0.001; and by 8.0 [2.0-47.2] ng/mg to 22.1 [10.9-37.5] ng/mg, p = 0.001). Eradication of H pylori also significantly increased antral D-cell density (8 [5-22] to 15 [9-22] cells per mm, p = 0.031) and decreased G-cell density (138 [89-161] to 88 [33-121] cells per mm, p = 0.016). The hypergastrinaemia in children positive for H pylori may be due to a deficiency of antral somatostatin, which inhibits gastrin synthesis and release.
Clinical use of a selective culture medium for wild and antibiotic-resistant Propionibacterium acnes.
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Selective elimination of Enterobacteriaceae species from the digestive tract in mice and monkeys.
In mice and in monkeys, ;selective' elimination of Enterobacteriaceae species from the digestive tract of animals with a sensitive flora was accomplished by oral treatment with nalidixic acid (1 mg./g. body weight in mice and 0.4 mg./g. body weight in monkeys). During treatment, the concentration of enterococci (and also of Candida albicans in the monkey) remained unaltered. This indicates that the fraction of the anaerobic microflora which is responsible for the colonization resistance of the digestive tract is not affected by the treatment. An important consequence seems to be, that elimination of yeast and fungi with fungistatic drugs can be started at the same time as elimination of Enterobacteriaceae is attempted.
The incidence of infective drug resistance in strains of Escherichia coli isolated from diseased human beings and domestic animals.
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The in vitro drug resistance of Salmonella dublin isolated from cattle.
The resistance of Salmonella dublin to eight antibacterial drugs was assessed under diagnostic laboratory conditions. Two techniques were used consecutively and the differences in the results are described. Strains of S. dublin isolated from either calves, adult cattle or abortion material showed no differences in resistance for either of the techniques, though differences between the two techniques were found.
Clonal distribution of resistance plasmid-carrying Salmonella typhimurium, mainly in the Middle East.
Strains of Salmonella typhimurium of predominantly Middle Eastern origin, but distributed from England to India, were found to carry at least three types of resistance plasmid. The most important was initially identified as an F(I) plasmid by compatibility tests, but differs from the F factor on the one hand and the F(I) factors R162 and ColV on the other. The three groups of F(I) plasmids can be distinguished by their compatibility reactions with the MP10 plasmid of S. typhimurium (Smith, Humphreys, Grindley, Grindley & Anderson, 1973) and group H(1) factors: the F factor is unilaterally incompatible with group H(1) (Smith, Grindley, Humphreys & Anderson, 1973; Anderson, 1975b); the F(I) factors are compatible with MP10 and group H(1); and F(I)me factors are incompatible with MP10 but compatible with H(1). The majority of S. typhimurium cultures belonged to phage type 208; most of those that did not, belonged to types related to 208. Only a minority of their F(I)me plasmids were autotransferring. The remainder were mobilizable by F-like plasmids, and by group H(1) and H(2) factors, but not by the fi(-) I(1) factor Delta, or by plasmids of the I(2), B, P, W, N and com 7 groups. The compatibility reactions of the autotransferring F(I)me plasmids were identical with those of the non-transferring members of the group, and both were large, single-copy plasmids.The S. typhimurium strains of this series carried A or AK, and SSu resistance determinants: small, probably multicopy, non-transferring plasmids similar to those originally described in phage type 29 of S. typhimurium (Anderson & Lewis, 1965b).These S. typhimurium cultures probably represent a clone of wide geographical distribution. The accurate epidemiological study of such clonal outbreaks requires, in addition to phage typing, precise identification of the plasmids harboured by the epidemic strains, and may have to be carried to the molecular level.F(I)me plasmids were identified in other drug-resistant salmonellas, notably in a strain of S. wien which caused large outbreaks of mainly paediatric infection in Algeria, and also spread to Britain. An F(I)me plasmid was found in S. typhi phage type 44 from Algeria, in which the phage-restricting properties of the plasmid are responsible for the specificity of the type.
Use of chick embryo infections for the study of drug resistance in Eimeria tenella.
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Segregation during transfer of infectious drug resistance in Enterobacteriaceae.
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Restriction of bacteriophage multiplication by resistance determinants in Salmonellae.
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How effective are rescue H. pylori eradication therapies in patients with dyspepsia?
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The detection of prophylactic drugs in animal feeding stuffs by thin-layer chromatography.
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Therapeutic activity of sulphadimethoxine and bifuran against E. tenella and effect of medication on the development of immunity.
Therapeutic activity of sulphadimethoxine and Bifuran in drinking water against different levels of infection (5,000 10,000, 25,000 and 50,000 oocysts per chick) with Eimeria tenella and effect of medication on development of immunity was assessed. Medication was started after 96 hours of the infection. Sulphadimethoxine gave better control (performance indices: 234, 193, 155 and 112, respectively) than Bifuran (performance indices: 194, 129, 74 and 40, respectively) against all levels of the infection tested. Effectiveness of both the drugs decreased with increasing levels of the infection. Both the drugs interfered in the development of immunity which was inversely proportionate to the level of infection. Interference in development of immunity was more with sulphadimethoxine but these chicks were still solidly immune to the challenge infection.