Biomedical subjects
Publications and source records attributed to V Sticht-Groh.
In vitro susceptibilities of anaerobic bacteria (Bacteroides spp., Fusobacterium spp., Clostridium spp., and Peptococcus sp.) and of Campylobacter jejuni and C. coli to niridazole and metronidazole were determined. The minimum inhibitory concentrations for niridazole ranged from 0.0037 to 1.0 microgram/ml and, for metronidazole, from 0.25 to 128 micrograms/ml.
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One hundred Pseudomonas aeruginosa isolates recovered from intensive care areas of a university hospital and other clinical sites were characterized on the basis of their susceptibility to a set of twenty one phages. These strains were previously mitomycin C induced for their pyocin production and their serovars were also determined. All isolates identified on the basis of belonging to the same O-serovars and pyocin patterns, belonged to oe phagovar group. Strains which were non-identifiable with commercial antisera, had to be typed by both phagovar assay and mitomycin C induced pyocin production. Neither phagovar assay nor pyocin production alone gave enough individual characteristics of any one isolate, as to allow proper identification. Patterns with the same configurations in both phagovar and pyocin groups were detected among strains within entirely different O-serovar groups.
In an eight-year-old boy who had acute gastroenteritis, examination of the faeces with specific isolation technique revealed Campylobacter fetus subspecies jejuni as the responsible pathogen. This is the first observation in the Federal Republic of Germany of an enteritis caused by Campylobacter.
One hundred randomly collected Psuedomonas aeruginosa isolates were examined during a two months period of time in order to determine their origin in a hospital environment. Initially, neither the source of the isolates, nor the patients' names were known. The serogroups were determined with commercial antisera, and the pyocin patterns were established with the simplified method of mitomycin C induced pyocin production. The results were analysed in the chi2 test. A highly significant probability value (p less than 00004) was taken as evidence of the identity of the isolates, especially among strains originating from the neurosurgical, surgical and medical intensive care units investigated. The simplified method of the originally devised mitomycin C induced pyocin production with a selected number of 'indicator' strains in conjunction with the initial serogroup determination by the commercially available antisera, allowed a rapid tracing of all Pseudomonas aeruginosa isolates. This combined method is recommended as an easy and useful epidemiological tool for the study of Pseudomonas aeruginosa hospital acquired infections.
Niridazole, a nitrothiazole derivative, exhibited marked antimicrobial activity against a group of microaerophilic campylobacter. MICs ranged from 0.0037 to 2.0 mg/l, with an average of 0.25 mg/l. The activity of niridazole was compared to that of chemically related compounds (metronidazole, ornidazole, tinidazole). Although their activities ran parallel, niridazole was found to be markedly more potent. Thirteen other common antibiotics were also inferior to niridazole with respect to their inhibitory effect. The antibacterial activity of niridazole was bactericidal. Its in vivo activity was also tested in mice infected orally with campylobacter. The organisms, which caused a chronic colonization of the gut in untreated animals, disappeared rapidly from the faeces after treatment with niridazole, at least in the case of a highly susceptible campylobacter strain.
Follow-up studies on 56 patients who suffered from antibiotically untreated, acute, monophasic neuroborreliosis five to 23 years ago revealed significant positive levels of IgG antibodies to Borrelia burgdorferi (Bb) in the serum and cerebrospinal fluid (CSF) of 20 patients (IFT, ELISA, Bb-specific IgG Western blot, Bb-specific IEF-IgG immunoblot). Nine of 10 tested patients had a definitely positive T-cell proliferative response to whole B. burgdorferi, with a mean (+/- -SEM) stimulation index of 7.2 +/- 1.8. Because the patients studied exhibited no, or only mild to medium sequelae without any evidence of a chronic-progressive disease, we interpret the long-term persistence of specific T- and B-lymphocyte responses to B. burgdorferi as an "immunological scar syndrome". Finally, diagnostic criteria of active neuroborreliosis are proposed.
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