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PubMed1999

[Typing of methicillin resistant strains of S. haemolyticus isolated from patients and from the hospital ward environment].

Biotyping, antibiograms and fingerprinting were used to determine the relation of 16 methicillin-resistant S. haemolyticus isolated from drains in patients who underwent intraabdominal surgery to 9 methicillin-resistant strains of S. haemolyticus isolated at the same time from hospital environment. The comparison of biochemical properties of the examined strains showed a large variety of biochemical profiles as well as antibiotic patterns of susceptibility. The differences in sensitivity to the antibiotics used were not distinct. Biotyping and antibiograms did not permit determination of the relation of the investigated strains. Only the results of fingerprinting allowed for the division of the 25 examined strains into three genotypes demonstrating three main patterns of PCR products. 16 strains of 25 showed the same pattern of PCR products. This results suggests the presence of a source of infection on the clinical ward. A nurse may have been the source of infection because the same genotype of S. haemolyticus was isolated from her nasal anterior as from the majority of patients.

Cross Infection↗
PubMedDate not supplied

[Blood cultures: use of presumptive antiobiograms].

Mortality associated to bacteremia varies between 20 and 40% depending upon several factors, such as focus of infection, microorganism, host conditions, etc. It has also been documented that mortality may double when the patient does not receive antibiotic treatment to which the microorganism is susceptible. The objective of our work has been to determine the correlation between disk diffusion antibiogram according to NCCLS guidelines, from isolated colonies, and the one performed directly from the blood culture flask. During 1996, in the Institute of Cardiology and Cardiovascular Surgery (ICYCC) in Buenos Aires City, 81 episodes of bacteremia were studied. In every case, an antibiogram was carried out: 1) from the bottle: a- Directly (D), harvesting 20 microliters in Mueller Hinton agar, b- Diluted (d), previous centrifugation and Gram staining to adjust turbidity equivalent to 0.5 Mc Farland; 2) from isolated colonies, according to NCCLS guidelines. There were almost no major errors, except with two strains of Enterobacter cloacae versus cephalotin. The diluted method was not so convenient to read inhibition zones, especially with staphylococci. With gram-positive bacteria, the main problems appeared in the direct method with erythromycin, oxacillin and ciprofloxacin because of minor errors. With gram-negative bacteria, major errors were observed in the direct method, mainly with piperacillin (7%) and to a lesser extent with piperacillin tazobactam (2%). Except for imipenem, trimethoprim sulfamethoxazoie and cefotaxime, all antimicrobial agents presented minor errors with both methodologies. Based upon the high rate of minor errors, we consider it is important to confirm results obtained with the standard technique (NCCLS), considering as presumptive those results from the blood culture bottles (D and d).

Anti-Bacterial Agents↗
PubMed2000

Clinical and community strains of Klebsiella pneumoniae: multiple and increasing rates of antibiotic resistance in Abha, Saudi Arabia.

Klebsiella pneumoniae is the most commonly isolated bacterial species in a maternity hospital in Saudi Arabia. Here, 380 strains isolated in 1997 and 480 strains in 1999 were studied for their resistance antibiograms, using the standardised disc diffusion test. Of 16 antibiotics tested, four in 1997 and six in 1999 were ineffective against > 50% of the respective isolates, and resistance rates to 11 antibiotics increased over the two-year period (P = 0.05-< 0.0001). With resistance rates of < 20%, imipenem, ciprofloxacin, gentamicin and cefotaxime were more effective in 1997; only imipenem and ciprofloxacin remained as effective in 1999. In addition, 105 community strains were tested and > 50% were resistant to four antibiotics. Resistance rates to most antibiotics were lower than those of clinical strains (P = 0.0285-< 0.0001). Imipenem resistance was detected among both clinical and community isolates. Multiresistance was 64.5% in 1997 and 79.2% in 1999 (P < 0.0001), and 83.8% in community strains in 1999. Using the double-disc synergy test, extended-spectrum beta-lactamase (ESBL) was detected in 27.5% of ceftazidime-resistant clinical strains isolated in 1999. Among the clinical strains, seven (65%) and 11 (67.9%) resistance antibiograms occurred frequently in 1997 and 1999, respectively. Such frequency was not observed among community isolates. These findings confirm the alarmingly high rates of multiresistance and the emergence of ESBL-producing strains, highlighting the urgent need to restrict over-the-counter availability of antibiotics, and increase awareness in the local medical community.

Drug Resistance, Microbial↗
PubMedDate not supplied

Role of molecular typing in an outbreak of Salmonella paratyphi A.

During the post monsoon season of 1996 an outbreak of human Salmonellosis caused by Salmonella serovar-paratyphi A occurred in New Delhi and had continued for over 2 months. A total of 36 clinically diagnosed enteric-fever cases were reported during this outbreak. The isolates were compared following their characterisation by biotyping, antibiogram-analysis, plasmid-profiling and IS200 probing, to study the relatedness in order to delineate a common source. The study included representative strains from both outbreak (15) and sporadic (7) cases for comparative analysis. Biotyping, antibiogram, whole cell protein-analysis and plasmid-profiling could not discriminate sporadic cases from outbreak strains, suggesting that a single clone/type (PT-1) may be prevalent in our region. In contrast, molecular-typing using IS200-probing revealed 2 clonally related strains circulating during the outbreak, as compared to the unrelated sporadic strains which exhibited considerable genetic diversity. Molecular analysis by IS200-probing, helped to assign an index case which provided a history of later outbreaks, since paratyphi A was repeatedly cultured in later outbreaks also. The study also suggests that genetic rearrangements can occur during the emergence of outbreaks. It reaffirmed the usefulness of IS200-probing in epidemiological investigations of Salmonella enterica serovars.

Bacterial Typing Techniques↗
PubMed2001

[The sensitivity of common bacteria to antibiotics in children in southern Israel].

BACKGROUND: Many reports describe an increasing antibiotic resistance among various pathogenic bacteria. Since every empiric antibiotic treatment is also based on the expected antibiogram of the probable isolate, it is essential to frequently monitor the resistance trends at different ages and contexts. AIM: The purpose of this study was to monitor the antibiogram of a large bacterial population isolated from pediatric bacteremia episodes. METHODS: All bacteremia episodes of children under the age of 18 years in the Soroka Medical Center, Beer Sheva, Israel, were prospectively documented from January 1990 to December 1998. RESULTS: Of the 5,373 positive blood cultures that were noted during the study period, 1,689 were considered as true different episodes. During the years 1990-92, 1993-95 and 1996-98 454, 538 and 697 episodes were noted, respectively. The most common pathogens were Streptococcus pneumoniae (447 isolates), Staphylococcus aureus (224 isolates), Escherichia coli (187 isolates) and Klebsiella spp (180 isolates). The antibiotic sensitivity of the pathogens declined with time in some of the cases and increased in others. The major problems raised were the development of ESBL (extended spectrum beta lactamase) and MRSA (methacillin resistant Staphylococcus aureus) producing isolates, high level of resistance of coagulase negative Staphylococci and Acinetobacter to most of the antibiotic agents, and increasing resistance of Streptococcus pneumoniae to various agents. CONCLUSION: Despite the significant increase in the antibiotic resistance of many of the pathogens tested, there are still various therapeutic options available.

Bacteremia↗
PubMed1999

Detection of cross-transmission of multiresistant Gram-negative bacilli and Staphylococcus aureus in adult intensive care units by routine typing of clinical isolates.

OBJECTIVE: To determine the potential of laboratory services in identifying cross-transmission of multiresistant Gram-negative bacilli (MR GNB) and Staphylococcus aureus in adult intensive care units by routine typing of clinical isolates. METHODS: Over a 12-month period, isolates with indistinguishable PCR fingerprints were traced back to the source patients and their epidemiologic relationships were investigated. Possible episodes of cross-transmission were ascertained, and the validity of antibiograms in identifying the same cluster assessed. RESULTS: Of 3503 specimens received by the microbiological laboratory during 5372 patient days, 1295 cultures showed bacterial growth. Of these, 132 were primary isolates of MR GNB and 92 were primary isolates of S. aureus. Thirty-two MR GNB isolates (24%) shared fingerprints with one or more other isolates. Indistinguishable isolates from epidemiologically related patients suggested 17 episodes of cross-transmission. The positive and negative predictive values of antibiogram-based identification of these episodes were 19% and 72% respectively. S aureus displayed limited genetic diversity. The two most frequent genotypes contained 19 and 16 isolates, of which the majority appeared to be epidemiologically unrelated. CONCLUSIONS: Endemic transmission of MR GNB occurs mainly between two patients and remains unrecognized by conventional laboratory investigation. Rapid genetic typing methods identify patients involved in cross-transmission and give an insight into the population dynamics of MR GNB on adult intensive care units.

Journal Article↗
PubMed2002

Diarrhoeagenic bacterial pathogens in HIV-positive patients with diarrhoea in rural communities of Limpopo Province, South Africa.

Potential enteric bacterial pathogens in 60 HIV-positive patients with chronic diarrhoea in rural communities of the Limpopo Province, South Africa, were identified using standard microbiological methods. The Kirby-Bauer disk-diffusion method was employed to determine antibiograms of isolated bacteria. Results revealed that diarrhoeagenic bacterial agents were isolated from 48 (80%) of the 60 HIV-positive patients with diarrhoea. Forty-four (73.3%) and 16 (26.7%) of the 60 patients were female and male respectively in the age range of 17-55 years with a mean of 34 years. Bacterial pathogens isolated comprised Campylobacter species (20.0%), Plesiomonas shigelloides (16.6%), Aeromonas species (13.3%), and Escherichia coli, Shigella and Salmonella species (10.0% each). No attempts were made to isolate parasites, fungi, or viruses. Antibiotic susceptibility profiles revealed resistance of the isolates to ampicillin, cephalothin, chloramphenicol, erythromycin, and streptomycin. However, all (100%) of P. shigelloides and Salmonella species were sensitive to nalidixic acid and ciprofloxacin. Most isolates were susceptible to nalidixic acid, ciprofloxacin, and gentamicin, indicating the usefulness of these drugs, although antibiograms may not always correlate with clinical usefulness.

Adolescent↗
PubMed2002

[Microbiological External Quality Assurance Program (MEQAO)--evaluation of results obtained in 2001 of sanitary-epidemiological station laboratories].

The aim of this study was to evaluate reliability of identification and determination of sensitivity to antibiotics and chemotherapeutics of some Enterobacteriaceae strains in 49 sanitary-epidemiological stations. All laboratories engaged in this study received 4 strains each (S. marcescens phenotype ESBL+, K. pneumoniae phenotype ESBL+, S. Typhimurium and S. Newport) previously identified in the Department of Bacteriology of National Institute of Hygiene. The laboratories included in the survey were asked to determine the genus (serovar) of each control strain using the lowest number of biochemical test recommended by Institute and to determine of the sensitivity of the identified strains to antibiotics in accordance with the guidelines of the NCCLS and domestic recommendations. Only in 2 participating laboratories the identification of one of studied strains (K. pneumoniae) was completely bad and in 9 laboratories the serological identification of S. Newport was incomplete or serological type was not correctly recognised. In the determination of the sensitivity of the control strains to chemotherapeutic agents abnormalities were found in the technique of antibiogram and test for ESBL performing and incorrect selection of disc for antibiograms as well as erroneous interpretation of the results.

Clinical Laboratory Techniques↗
PubMed1992

Epidemiologic investigation of nosocomial outbreak of methicillin-resistant Staphylococcus aureus by plasmid pattern analysis.

Nosocomial infections caused by methicillin-resistant Staphylococcus aureus (MRSA) have become an important problem with increasing frequency. In order to learn if plasmid pattern analysis can be used in epidemiologic investigations of MRSA infections, the authors did plasmid extractions of 70 MRSA stock isolates using a rapid lysostaphin lysis method. All isolates carried at least one plasmid. Most of the isolates had one large plasmid of 24-28 megadaltons (Md). Many also carried one or two small plasmids. Accordingly, 12 different patterns were identified. From these background results, we applied this method to the investigation of two small nosocomial outbreaks of MRSA infection. It was found that the analysis of plasmid pattern and restriction endonuclease analysis are more discriminative than antibiograms. Strains with the same antibiograms can be different by plasmid analysis. It is concluded that the plasmid pattern with a restriction endonuclease analysis study is a reliable method for epidemiologic study of MRSA infections.

Cross Infection↗
PubMed1992

Restriction endonuclease fingerprinting of genomic DNA of Staphylococcus species of bovine origin.

Fifty-one staphylococcal isolates from mammary secretions of cows with subclinical mastitis were examined by antibiograms and DNA restriction endonuclease fingerprinting (REF). DNA REF differentiated closely related strains of each species isolated from mammary secretions of different mammary glands of the same cow and from the same mammary gland at different periods of the lactation cycle. In addition, REF analysis provided evidence concerning persistence of infection in the same or different mammary gland over different periods of the lactation cycle, and occurrence of infection with similar and dissimilar strains of each Staphylococcus species. Antibiograms were of limited value in differentiating closely related strains. The ease by which REF analysis can be performed together with the reproducibility and clarity of REF patterns suggest that this technique is useful for differentiating closely related and unrelated strains of Staphylococcus species isolated from bovine mammary secretions.

Animals↗
PubMed2003

Incidence of Vibrio cholerae serogroup O139 infection with low virulence in Hubli, Karnataka (India).

384 stool samples from patients with acute gastroenteritis were processed by standard culture techniques and antibiogram of V. cholerae was performed. Stool samples from 93 (24.22%) patients yielded V. cholerae, 58 (62.37%) of which were V. cholerae, El Tor O1 Ogawa, 31 (33.33%) V. cholerae O139 and 4 (4.30%) V. cholerae non O1 non O139. Of the culture proven cholera cases watery diarrhoea was observed in 79 (84.95%), vomiting in 57(61.29%), muscle cramps in 21 (22.58%) and sweating in 18 (19.35%). Majority of these patients presented with moderate dehydration 57 (61.29%). Mild dehydration was found in 19 (20.43%) and severe dehydration in 17 (18.28%). While majority of patients with O139 infection had mild to moderate dehydration 25 (80.65%), severe dehydration was more common with O1 infection 11 (64.71%). This study reflects the importance of monitoring the V. cholerae by serogrouping, antibiogram typing, which keep on varying constantly.

Adolescent↗
PubMed2004

A survey on current attitude of practicing physicians upon usage of antimicrobial agents in southern part of India.

CONTEXT: Antimicrobial resistance is a serious public health concern worldwide. Inappropriate prescribing, including the wrong drug, incorrect dose/duration, and poor compliance, contributes to it. OBJECTIVE: To identify factors determining the attitudes and practices of prescribers regarding antibiotic usage and to suggest measures that contain antibiotic resistance. DESIGN AND SETTING: With a convenient sample, general practitioners and specialists of both sexes from 5 districts of Tamilnadu state, India, were approached for the study. A slightly modified, self-administered, anonymous questionnaire of the Alliance for the Prudent Use of Antibiotics was used. The deciding factors to prescribe an antibiotic and the reasons for the attitude to prescribe a broad-spectrum antibiotic were elicited. RESULTS: Out of the 285 participants 120, 110, and 47 practiced at city, semiurban, and rural areas, respectively. The responses were graded with a total possible score of 150. There was no significant difference between men and women or between specialist and nonspecialists in scores. The majority believed that antibiotics are overprescribed. Purulent discharge (65%), antibiotic-resistance concerns (48%), fever (40%), and patient satisfaction (29%) were the strong influences to prescribe an antibiotic. Similar reasons were cited for the belief of prescribing a broad-spectrum antibiotic. The 3 most commonly prescribed antimicrobials were amoxicillin (21%), ciprofloxacin (18%), and co-trimoxazole (11%). About 42% used an antibiogram only to the extent of less than 10%. CONCLUSION: Patient requests/expectations, patient satisfaction, purulent discharge, and fever strongly pressurized practitioners to prescribe antibiotics. Patient and time pressures, diagnostic and treatment uncertainties, and the poor utilization and/or ill-affordable antibiogram facility all point to an urgent, multidimensional approach to contain antibiotic resistance.

Anti-Infective Agents↗
PubMed2004

[The rise in fluoroquinolone-resistant Neisseria gonorrhoeae among people attending the Municipal Health Service's clinic for sexually transmitted diseases in Amsterdam, the Netherlands; cefotaxime now first-choice treatment for uncomplicated gonorrhoea].

OBJECTIVE: To report the incidence of gonorrhoea and the development of resistance to Neisseria gonorrhoeae among attendees at the Municipal Health Service's STD-clinic in Amsterdam, The Netherlands, 2000-2003. DESIGN: Descriptive. METHOD: Urethral or cervical swabs for culture for N. gonorrhoea were taken from attendees at the STD-clinic. Depending on reported sexual techniques throat and rectal swabs were also taken. The disk diffusion technique in combination with a beta-lactamase test were used for sensitivity testing. RESULTS. The number of Neisseria gonorrhoeae (NG) isolates collected at the Amsterdam Municipal Health Service's STD-clinic decreased from 1047 in 2002 to 772 in 2003. The number of fluoroquinolone-resistant NG (FRNG) isolates rose from 3 in 2000 to 56 in 2003 (p < 0.001). FRNG isolates amongst men who have sex with men increased from 1 in 568 isolates (0.2%) in 2000 to 50 in 478 isolates (10.5%) in 2003 (p < 0.001). Amongst heterosexual men, FRNG rose from 2 per 275 (0.7%) in 2000 to 16 per 297 (5.4%) in 2002 and dropped to 6 per 190 (3.4%) in 2003 (p = 0.146). No FRNG isolates were found in women in 2003 (2000: 0/180 (0.0%); 2001: 2/160 (1.3%); 2002: 4/183 (2.2%). CONCLUSION: The recent incidence of FRNG among men who have sex with men to over 5% makes ciprofloxacin and other fluoroquinolones obsolete as the first-choice treatment option for uncomplicated gonorrhoea if no antibiogram is available. It is advised to use cefotaxim when an antibiogram is not available (yet).

Anti-Bacterial Agents↗
PubMed2003

[Resistance of bacteria and antibiotic prescription in Fann University Teaching Hospital, Dakar].

The objective of this study conducted in Fann University Teaching Hospital in Dakar, is to establish correlation beetwen the prescription and consummation of antibiotics in the one hand, and the susceptibility of strains isolated in this hospital on the other hand. An interview of medical practitioners and pharmacists was realised to appreciate the antibiotics used in the clinics, the bacteria taken aim, the criteria of choice, the place of antibiogram, the place of antibiotics in orders of medicines and pharmacists, the consummest family of antibiotics. In the lab, all of pathogen bacteria were tested by disc diffusion test (antibiogram) to appreciate the susceptibility to antibiotics. The results show that Enterobacteria represented 60.8% of isolates and among them, Escherichia coli (30.6%) was the most representative specie in hospitalized and non hospitalized patients. 52% of the strains of E. coli were susceptible to aminopenicillins in external patients, versus less than 35% in hospitalized. In Neurosurgery, Pseudomonas aeruginosa was the most frequent bacteria and all of the strains were susceptible to imipenem, dibekacin and ciprofloxacin. Beta-lactams were the most used drugs in the first place (78.8%), related to habits of prescription of medical staff and to avaibility of antibiotics. The choice of antibiotics must take the susceptibility of strains into account.

Anti-Bacterial Agents↗
PubMed2005

[Review on the etiology and treatment of bacterial pneumonias].

The bacterial pneumoniae are the significant factor of morbidity and mortality all over the world. So USA are at the sixth place per mortality cause. The bacteria are in 60-80% of cases the causes of pneumonia in the communities. Therefore this is the review on the ethiology of the verification and treatment of pneumonias in the 17-month period in the General hospital "Sarajevo". In the period of the 1st January 2002 till the 31st May 2003 year, it was examined 105 sputa on the antibiogram, and in 12 cases (11.4%) was found the positive bacterial finding. Most often were gram negative bacteria in 7 cases (58.3%), while were found the gram positive in 5 patients (41.7%). Therefore that the majority of the examinees belonged to the risk group, and that were the patients with over 50 years of age 11 (78.6%), with the chronic obstructive lung disease 5 (35.7%), with the malignant disease 1 (7.1%) and with the coinfection of the urinary tract. E. coli was found in 3 patient (25.0%), Kl. Pneumoniae in 2 (16.7%), Ps. aeruginosis in 1 (8.3%), Citrobacter freundi in 1 (8.3%), and in 2 cases (16.7%) were isolated. Staphylococcus intermedius and Streptococcus beta haemolyticus gr. A and Str. Pneumoniae in 1 case (8.3%). To the patients with the positive finding of sputum on antibiogram were most often administered empirically cefalosporia of the third generation because it was about the more severe patients, then the combination of ampicillin with gentamicin. All were dismissed as recovered or in better condition. Pneumonias is in the risk groups are possible to prevent to the five-years pneumococcus vaccine when is indicated or by influenza vaccine when simultaneously was prevented the viral, that is the possible bacterially superinfected pneumonia.

Anti-Bacterial Agents↗
PubMed2005

Spread of a single clone Acinetobacter baumannii strain in an intensive care unit of a teaching hospital in Turkey.

Acinetobacter baumannii is an important nosocomial pathogen, especially in immunocomprimised patients and those hospitalized in intensive care units. After the first isolation of A. baumannii strains from the bronchial aspirates of two patients in the intensive care unit (ICU) of our hospital as a pure culture, screening studies were performed to define possible source(s). A. baumannii strains isolated from bronchial aspirates and blood cultures of the patients in ICU were collected as a possible part of the outbreak. A total of 23 screening samples collected from equipment (7), hands (4) and gloves (2) of the staff, and from ten different body regions of the patients in the ICU were cultured. Antimicrobial susceptibility test of the isolates was performed by the standardized disk-diffusion method. All isolates were subtyped by antibiogram, arbitrarily primed polymerase chain reaction (AP-PCR) and pulsed-field gel electrophoresis (PFGE) typing methods. A total of 26 A. baumannii strains including eight clinical and 18 screening isolates were identified. All isolates were susceptible only to meropenem, tobramycin, and imipenem. There was at least a 96% resistance rate to the other antibiotics tested. Antibiogram typing showed that 24 of the 26 isolates were epidemiologically related, two were unique. AP-PCR yielded two types, one of which had 21 isolates, the other had five. PFGE fingerprinting revealed that all isolates were clonally related, including four closely related and 22 indistinguishable strains. Based on the results of PFGE which has been accepted as a reference method it can be concluded that A. baumannii strains isolated from our intensive care unit originated from a single type of strain.

Acinetobacter Infections↗
PubMed2006

[Microbiological isolates in patients with febrile neutropenia and hematological neoplasias].

We studied the frequency of culture isolation, type of microorganism isolated and local pattern of resistance in 309 adult febrile neutropenic inpatients with hematological neoplasm, who were hospitalized between January 1998 and December 2003, in Caracas University Hospital (Hospital Universitario de Caracas), in Venezuela. There were 576 febrile neutropenic episodes. Organisms were isolated in 41% of 940 cultures. The most common organisms involved were gram-negative bacilli (48%), followed by gram-positive cocci (35.1%), fungal (11.5%) and other agents (5.4%). Coagulase-negative staphylococci (22.4%) and Escherichia coli (13.4%) were the most isolated; 58.5% of 479 agents isolated had an antibiogram; 62.2% of coagulase-negative staphylococci and 23.1% coagulase-positive staphylococci were oxacillin-resistant. We did not find any vancomycin-resistant organisms. The gram-negative antimicrobial sensitivity for imipenem was 96.2%, cefepime 81%, and ceftazidime 57.5%. Tazobactam-piperacillin and sulbactam-cefoperazone were tested in 26% of antibiograms and had activity of 57.1% and 77.5%, respectively. Fungi were not characterized. Betalactamases producing gram-negative bacilli were found. In general, micro-biological identification and local vigilance of antibacterial resistance pattern must be done routinely in these patients, in order to improve empiric therapy guidelines.

Adult↗
PubMed1990

[Use of aztreonam in the perioperative prevention in burned patients].

The perioperative short-term prophylaxis is often used in burned patients. The basic of an adequate choice of the antibiotics is the knowledge of the kind of bacteria present in the burned areas. Because of the quality and the diversity of the bacteria, it is generally necessary to use an antibiotic combination chosen on the basis of the latest antibiogram. The Authors refer their experience of 15 cases treated with combination of aztreonam-oxacillin (10 cases) and aztreonam-tobramycin (5 cases) chosen on the basis of the latest antibiograms performed some days before surgery. The antibiotics were administered intravenously 1 hour before surgery. Three subsequent administrations every 8 hours followed. The microbiological and clinical results were positive. No systemic septic complication was reported and a global take of the skin graft was observed.

Aztreonam↗