Detection of biofilm formation among the clinical isolates of Staphylococci: an evaluation of three different screening methods.

PURPOSE: The purpose of this study was to evaluate three methods for detection of biofilm formation in staphylococci. METHODS: For detection of biofilm formation, 152 clinical isolates of Staphylococcus spp. were screened by tissue culture plate (TCP), Tube method (TM) and Congo red agar (CRA) method. RESULTS: Of the 152 Staphylococcus spp. 88(57.8%) displayed a biofilm-positive phenotype under the optimized conditions in the TCP method and strains were further classified as high 22 (14.47 %) and moderate 60 (39.4 %) while in 70 (46.0 %) isolates weak or no biofilm was detected. Though TM correlated well with the TCP test for 18 (11.8 %) strongly biofilm producing strains, weak producers were difficult to discriminate from biofilm negative isolates. Screening on CRA does not correlate well with either of the two methods for detecting biofilm formation in staphylococci. CONCLUSION: The TCP method was found to be most sensitive, accurate and reproducible screening method for detection of biofilm formation by staphylococci and has the advantage of being a quantitative model to study the adherence of staphylococci on biomedical devices.

Factors that influence morbidity and mortality in sever preeclampsia, eclampsia and hemolysis, elevated liver enzymes, and low platelet count syndrome

To evaluate the prognostic factors affecting morbidity and mortality in severe preeclampsia, eclampsia and hemolysis, elevated liver enzymes, and low platelet count [HELLP] syndrome cases. We retrospectively evaluated, 2245 cases who delivered in the Department of Obstetrics and Gynecology, Faculty of Medicine, Cukurova University, Turkey between January and December 2002. Ninety-three cases had severe preeclampsia, 26 cases eclampsia, 19 cases HELLP syndrome, and 6 cases with eclampsia and HELLP syndrome were included in this study. The pregnancy induced hypertension cases were evaluated retrospectively for socioeconomic status, obstetrical history, biochemical parameters, and maternal complications. The incidence of preeclampsia was 20.1% [453/2245], the incidence of severe preeclampsia, eclampsia, and HELLP syndrome was 6.4% [144/2245]. These ratios are higher than that reported in the English literature. The complication rate was 38% in severe preeclampsia cases. Among the severe preeclampsia cases, 32 had eclampsia [22.1%], and 25 had HELLP syndrome [17.3%]. The most important biochemical marker for maternal mortality is bilirubin levels. Maternal mortality was statistically higher in cases with jaundice. Also, there was a statistically significant relation between maternal complications and liver function tests, lactate dehydrogenase levels, and low platelet levels

Detection of vancomycin resistant Staphylococcus aureus: a comparative study of three different phenotypic screening methods.

The objective of this study was to investigate screening methodologies, to detect Staphylococcus aureus strains with decreased susceptibility to vancomycin. Three methods were used to screen 160 Staphylococcus aureus clinical isolates along with ATCC quality control strains. Subsequently, MIC of all these 160 strains were determined by NCCLS methodology. The MIC of all the 160 clinical isolates was < or = 4 microg/mL and were classified as vancomycin susceptible by NCCLS criteria but 23 strains were positive by Hiramatshu method, two grew on MHA (5 microg/mL vancomycin) while CDC method correctly identified no vancomycin intermediate S.aureus (VISA) or vancomycin resistant S.aureus (VRSA) strains with reference to there MIC. CDC method was found to be the most appropriate screening methodology for detection of VISA or VRSA for diagnostic laboratories.