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Biomedical subjects

A Audurier

Publications and source records attributed to A Audurier.

At least 55 records · Page 3Linked to original sources
PubMed1986

Aspects of the epidemiology of human Listeria monocytogenes infections in Britain 1967-1984; the use of serotyping and phage typing.

Strains of Listeria monocytogenes from 475 cases of human listeriosis collected during 1967-1984, belonged to one of three serogroups (1/2, 3 or 4). They were phage typed with a set of 28 phages to investigate three aspects of the epidemiology of listeriosis. Three patients each had two episodes of listeriosis, 3 months to 2 years apart, with strains of the same serogroup and indistinguishable by phage typing. Ten episodes of possible cross-infection between pairs of neonates in the same hospital occurred; the first baby was ill at or within 1 day of birth, and the second baby became ill 8-12 days after contact with the first. In each pair the L. monocytogenes strains were of the same serogroup and indistinguishable by phage typing. In three clusters of cases there may have been a common source of infection. L. monocytogenes strains from 10 of 11 cases of listeriosis in the Carlisle area in Jul.-Dec. 1981 were of the same serogroup; nine strains were non-phage-typable. The second cluster involved four adults treated at one hospital and the third a pair of neonates who were ill shortly after birth. In each cluster, strains were of the same serogroup, and were indistinguishable by phage typing. These last two clusters occurred during a short period when an unusually high proportion of strains from all cases of human listeriosis in Britain were indistinguishable by phage typing from the cluster strains, suggesting the possibility of common source infection.

Adult↗
PubMed1986

Comparison of Listeria serotypes and phage types isolated from sheep, other animals and humans.

A total of 814 different faecal, nasal, vaginal and milk samples of 50 healthy cotted sheep was investigated for Listeria during an epidemic-free summer season. Forty ewes and 5 tegs excreted Listeria strains; 18.1% of all samples were positive. A total of 151 Listeria monocytogenes strains belonging to serotypes 1/2, 4, 5, 6 and unknown were identified and phage typed. On the basis of the serotype and phage type of the excreted strains the animals could be divided into 7 groups. Characters of strains isolated from the cotted sheep were compared with those cultivated from 68 dead animals received from 44 distinct settlements. Also properties of 10 Listeria strains originating from 8 ill patients infected in the same region from where the carcasses of the animals were sent to the laboratory were studied. Two human Listeria strains were identical in serotype and phage type with some animal strains.

Adult↗
PubMed1986

[Antibiotic sensitivity of bacteria isolated from pathological specimens and utilization of beta-lactams in an orthopedic surgery service].

From 1980 to 1984, computerized data on the sensitivity to the main antibiotics of 1991 strains isolated from clinical specimens were evaluated in relation to beta-lactam use and hospital activity in a unit of orthopedic surgery. No major variations were found in distribution of species throughout the study period, whereas sensitivity to antimicrobial agents changed. From 1980 to 1982, patients had postoperative prophylactic treatment with cephalosporin (cefazolin) for two days; during the same period, 59% of 557 Gram negative organisms were resistant to cefazolin and 31% of Staphylococci were resistant to methicillin (and to other antibiotics). In 1983 and 1984, cefazolin was replaced by intraoperative flash therapy with a penicillin-M (cloxacillin); concomitantly, sensitivity to cefazolin increased among Gram negative organisms (38% of 485 isolates were cefazolin-resistant; p less than 0.001) and Staphylococci (16% of 342 isolates were methicillin-resistant; p less than 0.001). Phage typing of S. aureus failed to disclose any epidemic outbreak. Since hospital activity remained the same throughout the period under study, it seems justified to correlate the increase in bacterial sensitivity observed to the decrease in use of cephalosporin, although other factors (microepidemic, isolation techniques) may be involved.

Anti-Bacterial Agents↗
PubMed1986

[Cloxacillin concentration in suction fluid following flash antibiotic therapy during insertion of a hip prosthesis].

Since 1982 we have administered cloxacillin intraoperatively during total hip replacement. 1 g cloxacillin is injected intravenously at induction of anesthesia, followed by 1g every hour until the end of the procedure or a total of 6 g. In our study, cloxacillin concentrations were determined in the fluid collected from the deep suction catheter inserted at the end of the surgical procedure. Fluid samples were collected 2 h, 4 h, 6 h, 8 h and 24 hours after the last injection of cloxacillin. Serum samples were taken 2 h, 6 h and 24 hours after the last injection. Cloxacillin was assayed using an agar-diffusion microbiologic method. 18 patients were studied. Each had received 3 to 5 g cloxacillin over 3 to 5 hours. Mean suction catheter fluid concentrations were to 69.7 micrograms/ml, 37.6 micrograms/ml, 24.2 micrograms/ml, 15.5 micrograms/ml, and 6.8 micrograms/ml respectively in the samples collected 2 h, 4 h, 6 h, 8 h and 24 hours after the last injection of cloxacillin. Mean serum concentrations were 34.1 micrograms/ml, 4.2 micrograms/ml, and 0 microgram/ml respectively 2 h, 6 h and 24 hours after the last injection. Our results indicate that cloxacillin concentrations within the hip joint are probably effective against staphylococci for 8 to 12 hours.

Aged↗
PubMed1985

Pasteurized milk as a vehicle of infection in an outbreak of listeriosis.

Between June 30th and August 30th, 1983, 49 patients in Massachusetts acquired listeriosis. Seven cases occurred in fetuses or infants and 42 in immunosuppressed adults; 14 patients (29 per cent) died. Of 40 Listeria monocytogenes isolates available for testing, 32 were serotype 4b. Two case-control studies, one matching for neighborhood of residence and the other for underlying disease, revealed that the illness was strongly associated with drinking a specific brand of pasteurized whole or 2 per cent milk (odds ratio = 9, P less than 0.01 for the neighborhood-matched study; odds ratio = 11.5, P less than 0.001 for the illness-matched study). The association with milk was further substantiated by four additional analyses that suggested the presence of a dose-response effect, demonstrated a protective effect of skim milk, associated cases with the same product in an independent study in another state, and linked a specific phage type with the disease associated with milk. The milk associated with disease came from a group of farms on which listeriosis in dairy cows was known to have occurred at the time of the outbreak. Multiple serotypes of L. monocytogenes were isolated from raw milk obtained from these farms after the outbreak. At the plant where the milk was processed, inspections revealed no evidence of improper pasteurization. These results support the hypothesis that human listeriosis can be a foodborne disease and raise questions about the ability of pasteurization to eradicate a large inoculum of L. monocytogenes from contaminated raw milk.

Adult↗
PubMed1985

A multi-centre study on the phage typing of Listeria monocytogenes.

The aim of this multicenter study was to determine and to standardize methods in order to have common basis for comparing results of phage typing of Listeria monocytogenes. Using a common set of Listeria strains, a standardized method, including media, bacterial growth conditions, application of viruses and reading of lytic reactions, was established. 29 bacteriophages were selected according to their host range. This phage typing system allowed phagovar determination of 54% of the serogroup 1/2 strains and 77% of the serogroup 4 strains of L. monocytogenes.

Bacteriophage Typing↗
PubMed1985

[Antibiotic therapy of pneumopathies in intensive care and protected distal bronchial samples].

Bacteriology was performed on 57 specimens collected by the Wimberley protected catheter bronchoscopy technique (PCB) from 42 ventilated patients with severe head trauma hospitalized in the neurosurgical intensive care unit to determine the etiology of their pneumopathy. All patients had a nasotracheal tube upon arrival at the intensive care unit. For each sample, smears were examined and cultures under aerobic and anaerobic conditions as well as with CO2 were performed. In 34 (59%) of the 57 cases, examination of smears allowed rapid diagnosis and appropriate chemotherapy. In 47 (82%) cases, culture was positive, with a single pathogen being recovered in half of cases. The most prevalent organisms among the 75 species isolated were S. aureus (38%), P. aeruginosa (15%), Klebsiella (12%), Haemophilus (8%), and Pneumococcus (9%). Consistency with positive cultures of blood or pleural effusion samples was recorded in 92% of cases. Narrow spectrum antibiotic therapy can be chosen according to the results of PCB bacteriology and rapid automated antibiotic sensitivity testing obtained within 24 hours. PCB is therefore recommended in pulmonary infections in intensive care units.

Adolescent↗
PubMed1985

[Bacterial contamination of the air in different operating rooms].

Bacteria air samples were taken in the operating rooms, with no people present, to specify the level of air contamination and suggest bacteriological standards for different operating rooms. In the first step of this study, for 5 months the air contamination mean value of operating rooms, ventilated at 15 changes/hour was 18.5 Cfu/m3 +/- 1.9. In the second part of the study, during two years, 1 381 air samples were taken in 8 different operating rooms. The mean values of air contamination range from 1.4 Cfu/m3 in a Charnley isolator system to 121 Cfu/m3 in an operating room ventilated at 7.5 changes per hour. As a general rule, the airborne contamination is more significant in the oldest operating rooms than in the new one with filtrated air. The variations observed between 1981 and 1982 are explained by technical modifications of the system or progress in control of operating room conditions. Measurements of the bacterial contamination of the air give useful informations, but it is however better to ensure that the specifications for volume air supply and positive air pressure in the operating theatres are being fulfilled. The airborne bacterial concentration in a modern ventilated operating room should not exceed 30 Cfu/m3.

Air Microbiology↗
PubMed1984

[Postoperative infectious risk in traumatic bone surgery and protocol for antibiotic therapy].

Eleven hundred and sixty eight traumatic cases have been operated on under constant conditions in a conventional operating room with filtered air and positive pressure using absolute filters of 99.999 efficiency. Two hundred and five were submitted to post-operative prophylactic administration of Cephalosporin (Cefazolin) for 2 days. The overall results showed 0.6 p. 100 of infection but 4 cases of severe sepsis were seen in the group of patients who had received prophylactic antibiotics. The authors have compared these results with those obtained during the previous period when the operating room was less modern. They conclude that this factor is of paramount importance. On the other hand, they have observed 2.1 p. 100 of contaminated drains without subsequent infection. They are concerned at the increase of gram-negative organisms resistant to Cefazolin (60 p. 100) and of Staphylococci resistant to Methicillin (30 p. 100). They conclude that the peroperative flash technique of the administration of Penicillin M is worthwhile.

Aged↗
PubMed1984

[Listeria strains isolated from sick animals and consumed silage].

Forty-eight strains of listeria isolated from sick animals (27 goats, 19 sheep, 2 cows) from 33 farms, and 40 isolated from the silage eaten by these animals were studied. Listeria were isolated more frequently from poor quality silages than from those of good quality, although they were found in 11 out of 31 excellent silages with a pH value comprised between 3.6 and 4. The 88 strains were characterized by biochemical and serological examinations, phage typing and measurement of their virulence. They showed a wide variety of characteristics and in only one case, three strains with the same characteristics were isolated one from a dead ewe with symptoms of encephalitis and the two others from the silage it had eaten. In four flocks, identical strains were found in several animals from each farm, but in five other flocks, strains isolated from animals were different. The listeria of the silage may be the direct cause of the disease, but the isolation of strain with different characteristics from animals of the same flock led us to think that other causes might favour the infection. So, it seems difficult to control the disease only by enhancement of the quality of the silage.

Animal Feed↗
PubMed1984

A phage typing system for Listeria monocytogenes and its use in epidemiological studies.

A phage-typing system for Listeria monocytogenes is necessary to eludicate its transmission and spread. We describe the general characteristics of a phage-typing system for L. monocytogenes and its use in selected epidemiological studies. Previously 78.4% of 823 strains of Listeria isolated in France between 1958 and 1978 were typable with a set of twenty phages isolaged from lysogenic strains. We now use twenty-seven phages; six derived from serovars 1/2a and 1/2b, eight from 4b, and thirteen from 4ab, 3c, 5, 6a and 6b. We used this system to examine 186 strains isolated during and after an outbreak in the province of Anjou which occurred during 1975 and 1976. One hundred and eight of these strains were of one phage type (octal code 000 420 000). Using this system we confirmed two cases of cross-infection in hospital neonates in England. Our results show that the reproducibility of the technique and the discrimination of the system are satisfactory for routine use. However, further testing and development of this system are underway.

Bacteriophage Typing↗