Epidemiology of Serratia marcescens Isolates by Transferable Resistance Gene Analysis

Conjugative R plasmids derived from 74 clinical isolates of Serratia marcescens were epidemiologically analyzed for antimicrobial resistance, EcoRI restriction endonuclease analysis and Southern hybridization with DHFR, TEM and SHV probe. 1. Resistance frequency of isolates against various B-lactam antibiotics was changed by year. 2. Twenty (27%) resistant strains transferred 32 R plasmids to E. coli or Klebsiella by mixed culture. Most strains isolated from 1994 to 1996 transferred only trimethoprim resistance but most strains isolated from 1997 did resistances against gentamicin (Gm) and B-lactams including ampicillin (Ap), carbenicillin (Cb), cefazolin (Cz), cefaloridine (Cl), cefamandole (Cn). 3. Ten plasmids of GmApCbCzC1Cn or GmApCbCzC1 pattern and 3 plasmids of TcSuGmTbApCbCzC1 pattern respectively showed identical EcoRI restriction endonuclease digestion patterns and hybridized fragment patterns with TEM-1 probe by Southern hybridization. These results indicate that the epidemic plasmids carrying blamM gene were present in this hospital in 1997 and molecular genetic analysis of R plasmids can be used to discriminate S. marcescens isolates for epidemiologic studies.

Empleo del dot-enzimoinmunoensayo en la valoración de la proteína A de Staphylococcus aureus / Dot-immunobinding assay use in valoration of protein A from Staphylococcus aureus

Se describe un método inmunoenzimático, que, por su gran sensibilidad, permite detectar pequeñas cantidades de proteína A presente en la membrana celular de determinadas cepas de Staphylococcus aureus o la liberada en el medio de cultivo. Esta técnica del dot-enzimoinmunoensayo permite poner en evidencia concentraciones de hasta 0,115 ug.ml-1 de proteína. Comparando los resultados obtenidos con la técnica de inmunodifusión radial, se confirma su mayor sensibilidad y la posibilidad de utilizar un método específico y de fácil realización en el dosaje de proteína A.

Comparison of two assay techniques for B-lactamase activity

Two techniques for the assay of B-lactamase activity have been compared. 10 strains of Staph. aureus and 13 strains of Gram negative bacteria were estimated for B-lactamase activity [Penicillinase and cephalosporinase] BYUSING Perret's macroiodometric method and rapid spectrophotometric Yamabe's method. Strong correlation between the two methods was obtained with staphylococcus exo-penicillinase while a moderate correlation was obtained with cellular Gram negative penicillinase. The iodometric assay was rapid, reliable and does not require any specialized or expensive equipment

Incidencia y drogorresistencia de Neisseria meningitidis en Matanzas, Cuba, en el bienio 1985-1986 / Incidence and drug-resistence of Neisseria meningitidis in Matanzas, Cuba, in the biennium 1985-1986

Se realiza un estudio de 93 muestras procedentes de pacientes com meningoencefalitis y meningococcemia a los cuales se les realizó toma de muestra de líquido cefaloraquídeo (LCR) y hemocultivo respectivamente. Dichas muestras se procesaron según las Normas Técnicas de Microbiología realizándose el aislamiento y caracterización de los microorganismos incidentes, demonstrándose que el 82,79% de los gérmenes aislados correspondieron a Neisseria meningitidis y de ellas el Serogrupo B, Serotipo 15 fue el de más alto índice (93,5%). Analizando los resultados de los antibiogramas por difusión de estas cepas, se pudo demostrar que la mayor sensibilidad correspondió al cloranfenicol (96,1%) y el mayor valor de resistencia fue para la Cefaloridina (36,36%)

A Survey for Methicillin / 대한정형외과학회잡지

Nine strains (6%) were confirmed as resistant (MIC=20ug/ml) to methicillin (MT) among 150 isolates of staphylococcus aureus. These MT-resistant staphylococcus aureus (MRSA) strains were also turned out to be more less resistant to other antibiotics tested, such as penicillin, chloramphenicol, tetracycline, and gentamicin except for cephaloridine. It was noteworthy, however, that strain MRSA 5 showed a relatively susceptible attitude toward most of the antibiotics tested, while being extremely resistant to MT only. Salt (NaC1) containing (5-3%) media did not have any significant effect on the degree of MT-resistance of MRSA strains. There was, however, such a tendency as that by the addition of salt the degree of MT-resistance was lowered in the highly MT-resistant strains while enhanced in MT-susceptible ones. It was confirmed that penicillinase did not have any effect on the MT-resistance while most of the penicillin- resistant strains produced the enzyme.

Patellar Position in the Normal Adult Knee Preliminary Report / 대한정형외과학회잡지

Nine strains (6%) were confirmed as resistant (MIC=20ug/ml) to methicillin (MT) among 150 isolates of staphylococcus aureus. These MT-resistant staphylococcus aureus (MRSA) strains were also turned out to be more less resistant to other antibiotics tested, such as penicillin, chloramphenicol, tetracycline, and gentamicin except for cephaloridine. It was noteworthy, however, that strain MRSA 5 showed a relatively susceptible attitude toward most of the antibiotics tested, while being extremely resistant to MT only. Salt (NaC1) containing (5–3%) media did not have any significant effect on the degree of MT-resistance of MRSA strains. There was, however, such a tendency as that by the addition of salt the degree of MT-resistance was lowered in the highly MT-resistant strains while enhanced in MT-susceptible ones. It was confirmed that penicillinase did not have any effect on the MT-resistance while most of the penicillin- resistant strains produced the enzyme.

A Study on Children with Dysentery-like Stool from Taegu Area in 1980

A clinical and laboratory study was conducted on 75 children with dysentery-like stool, who had been admitted or visited to our pediatric department, during 8 months period from January to August 1980. The following results were obtained: One to five years of age group was affected most frequently(47%), Shigella flexneri was identified by stool culture in 23 cases(30%) and Entameba histolytica in 13 cases(17%). In bacillary dysentery group, fever was the most common symptom occuring in 83%, followed by abdominal pain in 35%. vomiting in 26% and convulsion in 22%. In amoebic dysentery group, fever was noted in 31% and convulsion in 8%, showing some contrast to the frequency of fever & CNS manifestation. About the character of diarrheal stool, 83% of bacillary dysentery group showed bloody, mucoid stool and 62% of amoebic dysentery group mucoid ones. Frequency of diarrhea was 11 times per day or more in 73% of bacillary dysentery patients, and 10 times per day or lese in 92% of amoebic dysentery patients. The result of sensitivity test of isolated Shigella to various antibiotics were as follow : 100% sensitive to kanamycin, gentamicin, amikacin, cephaloridine & rifampin, 87% to nalidixic acid, an4 4.3% to sulfonamide, chloramphcnicol, streptomycin, tetracyclin, ampicillin & bactrim. And 22 out of 23 isolated Shigella strains revealed multiple- drug-resistance pattern on 6 or more antibiotics.

Causative Organisms and Antibiotic Susceptibility of Urinary Tract Infections in l97l and l976 / 대한비뇨기과학회지

In patients with urinary tract infections, institution of specific therapy should be preceded by careful examination of the urine and quantitative bacteriology from properly collected urine specimens. A clinical study on patients with urinary tract infections was done for observation of the changing trend in causative organisms and their susceptibility to antibiotics at Yonsei Medical Center in 1971 and 1976. The following results were obtained. 1) In 1971, 571 patients (male:2l1, female :360) with urinary tract infections were observed and in 1976, 647 patients (male :265, female :382) were observed. The ratio of male to female was 1 : 1.4-1.7, the most cases (above 60%) belonged to age group 20-49 years in both year. 2) The causative organisms of urinary tract infections were E. coli, enterobacter, staphylococcus and etc in 1971 and E. coli, enterobacter, klebsiella and etc in 1976 orderly. Cases of urinary tract infections by enterobacter and staphylococcus were decreased and cases by klebsiella, proteus and pseudomonas were increased in 1976. Urinary tract infections by E, coli were about 60% of female patients and about 25% of male patients in both year. Incidence of mixed urinary tract infections was l0.5% in l971 and 15.1% in 1976. 3) The susceptibility rates of gram negative organisms were 30.3% to ampicillin, 72.2% to Kanamycin, 79.9% to neomycin and 51,5% to bactrim in l971 and 17.5% to ampicillin, 47.8% to Kanamycin, 68.7% to gentamycin and 71.8% to colimycin in 1976. The rates to chloramphenicol, streptomycin and tetracycline were about 20% in both year. 4) The susceptibility rates of gram positive organisms were 35.4% to chloramphenicol, 38.5% to orbenin, 81.0% to penicillin G and 11.8% to tetraycline in 1971 and 50.0% to chloramphenicol, 31.6% to orbenin, 64.5% to penicillin G and 22.4% to tetracycline in 1976. The rate to ampicillin in 1971 was 57.0% and to cephaloridin in 1976 was 78.9%. 5) The susceptibility rates of Pseudomonas were 79.5% to colimycin and 59.1% to neomycin in 1971 and 88.7% to colimycin, 56.3% to gentamycin and 59.2% to carbenicillin in 1976. The rates to streptomycin, tetracycline, bactrim and minocycline were low.

Causative Organisms and Antibiotic Susceptibility of Urinary Tract Infections in l97l and l976 / 대한비뇨기과학회지

In patients with urinary tract infections, institution of specific therapy should be preceded by careful examination of the urine and quantitative bacteriology from properly collected urine specimens. A clinical study on patients with urinary tract infections was done for observation of the changing trend in causative organisms and their susceptibility to antibiotics at Yonsei Medical Center in 1971 and 1976. The following results were obtained. 1) In 1971, 571 patients (male:2l1, female :360) with urinary tract infections were observed and in 1976, 647 patients (male :265, female :382) were observed. The ratio of male to female was 1 : 1.4-1.7, the most cases (above 60%) belonged to age group 20-49 years in both year. 2) The causative organisms of urinary tract infections were E. coli, enterobacter, staphylococcus and etc in 1971 and E. coli, enterobacter, klebsiella and etc in 1976 orderly. Cases of urinary tract infections by enterobacter and staphylococcus were decreased and cases by klebsiella, proteus and pseudomonas were increased in 1976. Urinary tract infections by E, coli were about 60% of female patients and about 25% of male patients in both year. Incidence of mixed urinary tract infections was l0.5% in l971 and 15.1% in 1976. 3) The susceptibility rates of gram negative organisms were 30.3% to ampicillin, 72.2% to Kanamycin, 79.9% to neomycin and 51,5% to bactrim in l971 and 17.5% to ampicillin, 47.8% to Kanamycin, 68.7% to gentamycin and 71.8% to colimycin in 1976. The rates to chloramphenicol, streptomycin and tetracycline were about 20% in both year. 4) The susceptibility rates of gram positive organisms were 35.4% to chloramphenicol, 38.5% to orbenin, 81.0% to penicillin G and 11.8% to tetraycline in 1971 and 50.0% to chloramphenicol, 31.6% to orbenin, 64.5% to penicillin G and 22.4% to tetracycline in 1976. The rate to ampicillin in 1971 was 57.0% and to cephaloridin in 1976 was 78.9%. 5) The susceptibility rates of Pseudomonas were 79.5% to colimycin and 59.1% to neomycin in 1971 and 88.7% to colimycin, 56.3% to gentamycin and 59.2% to carbenicillin in 1976. The rates to streptomycin, tetracycline, bactrim and minocycline were low.

Infantile and Childhood Shigellosis in Dae Jon area

Clinical and bacteriological studies were made on 37 cases of infantile and childhood shigellosis treated at pediatric department of St. Mary's hospital in Dae Jon from Jan. 1978 to Dec. 1978. The following results were obtained. 1. In sex distribution 21 were male and rest of them were female, and the M/F ratio was 1.8:1.0. 2. The peak age incidence showed the children of 1 to 6 years old. 3. The most frequent symptom was fever(76%) and abdominal pain was next. 4. S. flexneri was most frequentkly isolated (62.2%) and the next was S. sonnei(35.1%). 5. The result of sensitivity test in this study revealed that tobramycin was most commonly effective (92%) and cephaloridin was next. Ampicillin was less sensitive (22%) than the previous reports.

Studies on the Antivacterial Effect of Cephalosporin Derivatives / 대한피부과학회지

The minimal inhibitory concentration(MIC) of cephalosporin derivatives, (cephaloridine, cefazolin sodium, cephradine, cephapirin aodium, cephacetrile sodium, and cephalexin from various Korean drug companies) for Staphykcoccus aureus ATCC 25923 and Escherichia coli ATCC 25922 was measured by the tube dilution method, using Mueller-Hinton broth. The results obtained were as follows: 1) The MIC of each individual cephalosporin derivative, although produced by different manufacturers, was similiar or equal. 2) Against Staphyloeoccus aureus, cephaloridine and cephapirin had the lowest MIC while cephradine and, cephalexin the highest. Against E. coli, cephaloridine and cefazolin had the lowest MIC while cephradine and cephalexin the highest. 3) The MIC against Staphylococcus aureus was l5.6 to 250 times lower than that against E. coli in all cephalosporin derivatives. 4) The MIC against Staphylococcus aureus ranges from 0.0125 to l.0ug/ml and against E. coli from 1. 56 to 25ug/ml in all cephalasporin derivatives.