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Biomedical subjects

G Wauters

Publications and source records attributed to G Wauters.

At least 91 records · Page 5Linked to original sources
PubMed1987

[Th role of human intestinal flora on the metabolic activation of pyrolysis products].

The role of the intestinal flora on the metabolic activation of dipyrido 1,2-a:3',2'-d imidazole compounds was investigated with the Salmonella typhimurium test system, using strain TA98. The metabolic activation mixture was obtained from cell-free extracts from E. coli, B. fragilis and Cl. perfringens. Whereas these extracts were able to activate 2-AA (used as control), the 2 and 3 amino derivatives of dipyrido [1,2-a:3',2'-d] imidazole were not revealed as mutagenic.

Amines↗
PubMed1986

Infections caused by Kingella kingae: report of four cases and review.

Kingella kingae, formerly known as Moraxella kingae, is a fastidious, non-motile, coccobacillary, fermentative Gram-negative rod that has been chiefly associated with two types of infections in man: bone and joint infections, and endocarditis. We describe four patients with K. kingae infections, one with septicaemia, two with endocarditis, and one with osteoarthritis. The current literature on infections with K. kingae is reviewed.

Adult↗
PubMed1986

Identification of Yersinia enterocolitica O15 lipopolysaccharide as a rough antigen.

Lipopolysaccharide (LPS) of a reference strain of Yersinia enterocolitica serovar O15, Ye614, was examined for its chemical structure and antigenicity. The O15 LPS was partially hydrolyzed with diluted acetic acid and fractionated on a Sephadex G-50 column. Only one peak was detected at fractions where the R-core oligosaccharide of a Y. enterocolitica rough strain was eluted. The chemical compositions of this oligosaccharide and the O15 LPS were similar to those of the R-core oligosaccharide and the rough LPS, respectively. The O15 LPS was antigenically identical to the rough LPS in immunodiffusion tests. These results indicate that the O15 LPS of Y. enterocolitica is rough LPS and that antigenic factor O15 is a rough antigen.

Animals↗
PubMed1985

Fatal meningitis due to multi-resistant Haemophilus influenzae type b.

We report the case of a 3-month-old boy suffering from an acute bacterial meningitis due to a multi-resistant strain of Haemophilus influenzae type b. Also presented is our current strategy of treatment and chemoprophylaxis of Haemophilus influenzae meningitis in children.

Ampicillin↗
PubMed1985

A simple adult-mouse test for tissue invasiveness in Yersinia enterocolitica strains of low experimental virulence.

The virulence of Yersinia enterocolitica depends on the presence of a 70-kilobase plasmid, called the Vwa plasmid. This situation is particularly favourable for studies of the mechanism of pathogenicity, but these are hindered by the lack of a suitable animal test to monitor the virulence of the human-pathogenic strains isolated outside the USA which belong to serogroups O:3, O:9 and O:5,27. We observed that, after oral administration to the mouse, the Vwa-positive strains of these serogroups produce a discrete systemic infection while the Vwa-negative strains do not. We present here a simple mouse-virulence test based on this observation.

Animals↗
PubMed1985

Serogrouping of Clostridium difficile strains by slide agglutination.

Six different agglutinating antisera were obtained by immunizing rabbits with Formol-treated strains of Clostridium difficile. After appropriate absorption, these antisera were used to define six serogroups designated by the letters A, B, C, D, F, and G. Altogether, 315 strains of C. difficile from various origins were tested for slide agglutination by these antisera; 312 (99%) of them were agglutinated by one of these antisera. A and C were the most common serogroups. An excellent correlation, ranging from 85 to 100%, was found between the serogroup and the toxigenicity of the strains. The correlation between serogroup and sorbitol fermentation was higher, ranging from 89 to 100%. The results of this typing were compared with the clinical origin of the strains. Only strains of serogroups A, C, and D were isolated in 153 cases of antibiotic-associated diarrhea. This series included strains from three outbreaks; all the strains in two of the outbreaks belonged to serogroup C, and in the third, all the strains belonged to serogroup A. Strains of serogroups B, F, and G were only found in the stools of asymptomatic neonates or young children. In the latter samples, strains of serogroups A and D were found in the same ratio as in adults with antibiotic-associated diarrhea, but strains of serogroup C were seldom isolated. In patients treated with antineoplastic drugs and suffering from diarrhea, the distribution of the strains was the same as in cases of antibiotic-associated diarrhea.

Agglutination↗
PubMed1985

Pyrazinamidase activity in Yersinia enterocolitica and related organisms.

Pyrazinamidase activity was tested in 381 Yersinia strains from various ecological and geographical origins and belonging to the following species: Y. enterocolitica (five biogroups), Y. intermedia, Y. frederiksenii, Y. kristensenii, Y. aldovae, Y. pseudotuberculosis, and Y. pestis. The pyrazinamidase test was negative (Pyz-) in all bioserogroups of Y. enterocolitica, in which is usually harbored the virulence plasmid, and was involved in human or animal diseases. Y. pseudotuberculosis and Y. pestis were also Pyz-. The more ubiquitous bioserogroups of Y. enterocolitica, without naturally occurring virulence plasmid, and related species were all Pyz+. Pyrazinamidase activity allowed the separation of the pathogenic North American Y. enterocolitica isolates from other nonpathogenic strains within biogroup 1. Similarly, environmental biogroups 3A and 3B were clearly distinguished from pathogenic biogroup 3. However, the pyrazinamidase test was not linked to the presence of the virulence plasmid itself and should not replace the pathogenicity tests to assess the actual virulence of an individual strain. This test proved to be a valuable tool to distinguish potential pathogenic from nonpathogenic strains of Y. enterocolitica in epidemiological surveillance programs.

Amidohydrolases↗
PubMed1984

Semisolid selective-motility enrichment medium for isolation of salmonellae from fecal specimens.

A semisolid selective-motility enrichment medium for the isolation of salmonellae from fecal specimens was developed which was based on Rappaport enrichment broth. During a 7-year period more than 30,000 stool samples were tested. The medium showed a high specificity (95.1%) and sensitivity (80.3%) when compared with MacConkey agar, SS agar, and brilliant green agar (after Selenite-F Enrichment [BBL Microbiology Systems]). Furthermore, our isolation rate of Salmonella species from fecal samples showed an increase of 22.3% when this semisolid medium was added to the routine culture media. Growth could easily be interpreted. The medium has a bias toward the isolation of Salmonella paratyphi B, but it is unsatisfactory for detecting the nonmotile strains Salmonella typhi and S. paratyphi A.

Culture Media↗
PubMed1984

O:13a,13b, a new pathogenic serotype of Yersinia enterocolitica.

Forty strains of a new Yersinia enterocolitica serotype isolated in the United States from nonhuman primates and humans were characterized as serotype O:13a,13b. Most of the human strains were isolated from a large multistate outbreak of milkborne enteritis. A common antigenic factor between this new serotype and four previously described Y. enterocolitica (O:7,13; O:18; O:44; and O:44,45) led to recharacterization of the latter as serotypes O:7,13a,13b; O:18,13b; O:44,13a; and O:44,13a,45.

Agglutination↗