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S Ortel

Publications and source records attributed to S Ortel.

At least 37 records · Page 2Linked to original sources
PubMed1977

[New serovariants and/or antigen combinations of Listeria monocytogenes (author's transl)].

In 2111 samples of human faeces originating from 932 persons (midwives, pregnant women, slaughterhouse workers, laboratory workers, individuals with gastroenteritis and without specific symptoms) a total of 86 (9.22%) carriers of L. monocytogenes could be found. Serotyping revealed prevalence of serovar 1/2a (39%) which was characterized by beta-hemolysis and mouse pathogenicity; serovar 4b and 5, also showing beta-hemolysis and mouse pathogenicity, were met with in 11% and 2% of cases, respectively. The great proportion of non-hemolysing and apathogenic L. monocytogenes-strains (71 = 47.3%) was remarkable. They belonged to rare serovars (4a, 4ab, 4f, 4g) or, because of their O-antigen structure, could not be classified under the antigenic scheme by Donker-Voet and Seeliger. This was the case for 47 strains (approximately 31%). In these strains, O-antigen combinations V, VI, IX, XV and V, VI, IX, XIV, XV were found more frequently. With regard to epidemiology and epizootology no significance can be attributed to such strains. The question is raised whether these apathogenic and non-hemolysing serovars still should be classified among the species Listeria or whether they should be separated from this species.

Antigens, Bacterial↗
PubMed1975

[Listeria excreters and their epidemiological significance (author's transl)].

By using the best bacteriological methods of investigation and reading techniques we were able to discover 82 excreters from stool samples of 841 persons and to culture 113 Listeria monocytogenes strains of different serotypes (1/2a, 4a, 4b, 4ab). Following up several excreters over a longer time (1 1/2 years) revealed periods with positive and negative results. Strains of listeria isolated from the stool samples of pregnant women have a particular significance and act as pointers to virulence. In the presence of clinical factors suspicious of listeriosis and the excretion of serotypes considered virulent, prophylactic therapy with ampicillin should be carried out during pregnancy.

Abattoirs↗
PubMed1975

[Listeriosis during pregnancy and excretion of listeria by laboratory workers (author's transl)].

The occurence of listeriosis during pregnancy in a medical technician and listeriosis in a neonate gave rise to an investigation of all laboratory workers being employed in this medical institute for the excretion of L.m. There had been no work with listeria or material containing listeria. In 11 out of 12 female employees, excretion of L.m. was observed over an extended period of time, also with a change of serotypes (see Table 1 or Fig. 1). It was supposed that frequent contact with laboratory rats could have caused the infection. However, L.m. could not be demonstrated in samples of faeces and in organs of these animals. The positive findings might be explained by the ubiquitous occurence of L.m. and the associated frequent oral intake. Of 37 strains of different serotypes isolated, the haemolysing serotypes 1/2a and one haemolysing strain of serotype 4a showed criteria of virulence, whereas the latter were missing completely in the non-haemolysing strains of the serotypes 4a and 4b (see table 4). Testing of the strains for sensitivity to chemotherapeutics showed a reduced sensitivity of serotype 4a, particulary to lincomycin, which might be used as a criterion differentiation. The good sensitivity of L.m. to trimethoprim must be emphasized (see Table 3).

Adolescent↗