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Membranes from Gambro Lundia Nova dialyzers were investigated for presence of bacteria after hemodialysis with centrally and peripherally mixed dialysate. Centrally mixed dialysate was found contaminated with Pseudomonas aeruginosa, and bacterial cultures as well as electron scanning micrographs showed the presence of these bacteria on the dialysate side as well as on the blood side of membranes from dialyzers perfused with this dialysate during hemodialysis. No bacteria were found on membranes used with peripherally mixed dialysate, in which very few bacteria were found. Despite this the frequency of febrile episodes in patients submitted to hemodialysis with the two different dialysate mixing systems showed no significant difference in our material.
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Hundred thirty seven milk samples were investigated by the mastitis test "Sofia" after the "Breed" method for the assessment of cell content and by inoculation on 5% blood agar for bacteriological findings. A certain correlation between reaction degree and number of cell elements was established. The better expressed the test reaction the larger was the number of cell elements, but not always a full coverage was evident. A correlation existed between the number of cell elements and the bacteriological findings also. The stronger the reaction resp. the larger the number of cells, the more samples had positive bacteriological findings. The percentage of samples with positive bacteriological findings having a cell number of 500 thousand to 5 million cells per 1 cm3 of milk ranged within 70.83 to 96.30%, while for samples having a cell content above 5 million it was 100%. In the samples with positive reaction the bacteriological investigations established 38.48% staphylococci, 52.28% streptococci, and 10.74% various other microorganisms.
A prospective study of bacteriology in 14 cases of cavitating pulmonary infections and empyema is reported. Bacteriologic results were based on transtracheal aspirates or pleural fluid. Appropriate anaerobic bacteriologic methods were employed. Anaerobic bacteria were recovered in 11 patients (79%); they were the only pathogens isolated in 6 patients. The predominant species were Fusobacterium nucleatum, Bacteroides melaninogenicus, Bacteroides fragilis and Peptostreptococcus. Aerobic bacteria were present in 7 patients. The results indicate that anaerobes play a key role in most cases of cavitating pulmonary infections and empyema, and that proper culture of adequat specimens will generally establish the bacteriological diagnosis.
Suitable bacteriological techniques revealed anaerobic bacteria in 38 (33%) of 114 chronically discharging middle ears. The genus Bacteroides was cultured from 25 ears. Aerobic bacteriology showed the predominance of staphylococci, facultative enteric gramnegative rods, diphtheroid bacilli and Pseudomonas species. Anaerobic bacterial cultures were always mixed with aerobic bacteria. 12 ears were culture-negative, and 9 of the 108 Gram-stained smers revealed no bacteria. No significant difference in bacteriology was noted between ears with or without local antimicrobial treatment, or between profusely draining or only moist ears. The ears with postoperative recurrent infection or with clinical suspicion of cholesteatoma grew anaerobes significantly more often, and were seldom sterile. Because anaerobic bacteria are frequently associated with chronic otitis media, their characteristics with regard to susceptibility to antimicrobials and to air must be remembered in the choice of therapy.
Postmortem pathologic and bacteriologic reports were analyzed for 237 deaths occurring at a large institution for the mentally retarded from 1958 to 1973. Bronchopneumonia, aspiration pneumonia, and lipid pneumonia were frequently reported at autopsy, and in a total of 146 cases (61.6%) at least one type of pneumonia was reported. Postmortem bacteriologic cultures in a smaller group revealed high recovery rates of staphylococci (coagulase-positive), hemolytic streptococci, and gram-negative bacilli in throat and lung cultures. Enteric aerobic gram-negative bacilli were particularly frequent along with yeast (Candida albicans). The institutionalized retarded appear similar to other hospitalized populations, in that a large proportion of hospital-acquired respiratory infections is related to aerobic gram-negative bacilli. The high frequency of aspiration and its sequelae in this population is unusual, however, and post-mortem bacteriologic findings appear consistent with those of antemortem studies of cases of aspiration pneumonia.
The bacteriological quality of pooled human milk donated to the Oxford milk bank was analysed and the effects on bacteriology of sterilisation of the milk-collecting vessels in the home with hypochlorite solution and of Holder pasteurisation in a purpose-built human-milk pasteuriser were studied. Collecting milk in hypochlorite-sterilised vessels resulted in a significantly lower bacterial count of both pathogens and species of unlikely pathogenicity before pasteurisation and significantly increased the chance of pasteurisation giving a sterile product. Potentially pathogenic organisms grown in untreated milk were Escherichia coli, Staphylococcus aureus, and group B beta-haemolytic streptococci. Seven species of organisms of unlikely pathogenicity were also identified. Pasteurisation eliminated all potential pathogens from milk but did not reliably remove any of the species of unlikely pathogens. Banked human milk may be contaminated with bacteria which are known to be capable of producing lipases, proteases, and decarboxylases. Accurate pasteurisation, together with attention to the sterility of the collecting vessels, results in a bacteriologically safe product that retains many of the protective properties of raw milk.
Floors and other areas totalling 1800 m2, comprising conventional and specified-pathogen-free (SPF) units, were screened bacteriologically 6 times in a year. The contamination indices observed were lower within than outside the units, and lower in the SPF than in the conventional unit. Bacterial counts in rooms containing animals in the conventional and SPF units were very similar. In all of the areas investigated within the units, most of the samples revealed less than 2 colony forming units per cm2. In contrast, high degrees of bacteriological contamination were detected in the changing rooms after showering or washing before entry. Staphylococcus epidermidis was the dominant bacterial species isolated. The bacteriological spectrum did not vary between the areas surveyed.
A. General considerations: 1. Microbiological condition of the normal urine and urinary tract; 2. Infections of the urinary tract. B. Possibilities of the laboratory of microbiology in renourinary investigations: 1. Detection and significance of pathogenic microorganisms in the urine; 2. Quantitative uroculture: a. The significance of urocultures in asymptomatic bacteriuria; b. The significance of bacteriuria in clinical diseases of the urinary tract. 3. Other diagnostic possibilities in urinary tract infections. 4. Possible microbiologic localization in urinary infections. a. Washing the urinary bladder; b. Urethral catheterism; c. Evidence of bacteria-antibody complexes in the urine; d. Bacteriologic localization pattern in bacterial urethritis and prostatitis. 5. Testing against antibiotics. C. Bacteriologic examination of the urine: 1. Collecting the urine for bacteriologic examination: a. Collecting from the middle jet: I) from women II) from men III) from imobilized patients IV) from children b. Collection by suprapubic puncture 2. Screening methods and tests 3. Methodology and diagnostic tests in urinary tract infections. a. Cultures; b. Follow up of the results. c. Reporting the results.
Regular bacteriological control examinations of the dialysate may contribue to the elimination of pyrogenic and even septic reactions. Regular checks of HBS-Ag and HBS-Ab are an effective measure in the early diagnosis of hepatitis B, which is characteristically anicteric and follows a prolonged course in patients on regular dialysis treatment (RDT). Virological examinations can be helpful in the diagnosis of cytomegalovirus (CMV) disease in certain cases of unexplained fever. Regular bacteriological examination of the urine is important in the detection of a urinary tract infection possibly necessitating binephrectomy prior to transplantation. After renal transplantation bacteriological control examinations of the urine, determinations of HBS-Ag and HBS-Ab, complement-binding reactions to CMV and mycotic cultures from the throat, sputum and urine should be regularly performed. Urinary tract infections may be found in up to 88% of the transplanted patients. Hepatits-B infection was noted in 62.8% of this case material. Positive Candida albicans cultures from samples of the uurine usually indicate systemic Candida albicans infection. The described diagnostic measures contribute to an effective prophylaxis and therapy of infective complications in patients on RDT and after renal transplantation.
Salmonella infections are discussed as an example of the interdependence of the classification of infectious diseases on the one hand and the taxonomy of bacteria on the other. The term paratyphoid was first created as a name for a disease but was later turned into a common name for the cause and then refined into a specific epitheton of a species of bacteria. It was difficult to create terms for pathology as long as a reliable differentiation of related species of bacteria was not possible, so both a typhoid and an enteric form of paratyphoid fever were referred to, superimposing the clinical differentiation of typhoid fevers and food poisoning (enteritis infectiosa). Epidemiology and bacteriology cannot expect their classifications to determine the classification of bacteria on the level of genus and subgenus, but systematic bacteriology should not conserve or create species and subspecies that are unnecessary for applied medical bacteriology. The needs of epidemiology usually require identification and determination of serovar, biovar and phagovar of the individual strain, but for pathology it is important to classify series of strains on the basis of certain combinations of serovars, biovars, and phagovars as special forms.
To assess the bacteriological quality of unpooled expressed breast milk, a pilot bottle sample of each donation was examined before the milk was given to the neonate. Provided the milk did not contain greater than 2500 organisms/ml or potential pathogens it was used unheated. Milk containing between 2500 and 5000 organisms/ml and no potential pathogens was used after pasteurisation. Using these criteria, 67% of 460 donations were acceptable. However, because the bacteriological quality varied, 45% of domiciliary donations were discarded compared with only 29% of those from hospital.
The in vitro and in vivo reproducibility of the quantitative bacteriological analysis of sputum and bronchial secretions has been studied in patients with chronic bronchitis. Sputum produced during bronchial toilet showed a significant higher bacterial numeration than that produced by physiotherapy but the bacterial species identified were identical. No significant variations were observed between the qualitative and quantitative bacteriologic flora of bronchial secretions collected by bronchoscopy from different segments of the airways. Comparison of microbial counts on sputum specimens collected at different periods of the day and at weekly intervals over several weeks revealed that the sputum of clinically stable chronic bronchitic patients contain a relatively constant and potentially pathogenic bacterial flora. The emergence of a superinfection was emphasized by the parallel increase of the leukocytic and bacterial numeration of sputum.
The computer system of the Bacteriology Laboratory at the Hôpital Cardiologique in Lyon is one of the elements in the computer management of patient data. It dovetails in with the various units for admission, patient location, ward surveillance, outpatient appointments. The main objectives are as follows: to improve quality of sample information, to reduce clerical work and accelerate information circulation, to widen the scope of epidemiological research. Computers can register samples, edit laboratory work sheets, entry lists, record results, generate reports, give a visual listing of all analyses performed before a patient leaves hospital, list pending analytical results, make available in the total system all laboratory-validated information, produce automatic billing of analyses and statistical editing. The Bacteriology Laboratory has three visual display units and two printers at its disposal. Computer laboratory management has been operational since May 1977. First results are satisfactory and suggest extension of the system to other laboratories and handling of quality control.
The quantitative bacteriology of 13 chronic leg ulcers was sequentially assessed by both swab and biopsy culture techniques, and the effect of either a 10% benzoyl peroxide lotion or placebo lotion was evaluated. There was good correlation between the swab and biopsy culture techniques in 12 of the 17 instances where simultaneous swabs and biopsies were done. Though the benzoyl peroxide did not favorably affect the bacterial flora, ulcer healing did appear to correlate with quantitative bacterial counts. THREE of five ulcers containing fewer than 10(5) organisms per gram of tissue or per centimeter of ulcer surface area healed, while none of eight ulcers containing more than 10(5) organisms healed. Quantitative bacteriological measurements can serve as useful tools in evaluating healing of leg ulcers.
Two hundred and sixty nine beef, 230 sheep and 165 pig carcase surface were examined bacteriologically. Direct and indirect contact examination techniques were utilised. Colony counts per cm2 were expressed in geometric progression. Counting procedures, direct and indirect contact examinations, and effects of chilling were considered. Subsequently, results from an additional 489 beef, 520 sheep, and 408 pig carcases were employed to illustrate a count classification arrangement against which bacteriological monitoring assessments could be measured.