[Pseudomonas aeruginosa and cystic fibrosis: first colonization to chronic infection]. / Pseudomonas aeruginosa et mucoviscidose: "de la primocolonisation a l'infection chronique".

Pseudomonas aeruginosa (Pa) is the most common virulent respiratory pathogen in cystic fibrosis and is characterized by an important capacity of adaptation, adherence and communication. The factors of virulence of Pa play a major part in adherence with the respiratory epithelial cells and in occurrence of infectious episodes. The factors responsible for the transition of first Pa acquisition to the chronic infection are not elucidated yet. The system of secretion of type III and the quorum sensing (QS) play an important role. The QS would intervene in the maturation of the biofilm of Pa, responsible for the "mucoid" phenotype of Pa, associated to a degradation of the respiratory function. We made a retrospective study on the period 1984-2005 within the Center of Cystic fibrosis of Caen allow to determine the percentage of firstly-colonized and chronic infected patients with Pa according to age. At 6 months of life, 11% of the infants were colonized with Pa reaching 48% to 7 years and 85% at the 18 years age. The percentage of chronic children carrying Pa was 0% at 1 year, 11% at 4 years, 44% at 12 years and 74% at 18 years according to the method of Kaplan-Meier. Comparing the period 1984-1994 with that of 1995-2005, the firstly-colonization and the chronic carrying of Pa occurred earlier and significantly during the second period. The current objective, beside the respiratory care, comprises the maintenance of an optimal nutritional statute and, waiting for an effective vaccine, the development of new therapeutic targets in order to attenuate the virulence of the stocks of Pa and as much as possible to delay the age of firstly-colonization and the age of chronic colonization with mucoid Pa.

Quantitative analysis of HCMV DNA load in whole blood of renal transplant patients using real-time PCR assay.

BACKGROUND: Preemptive antiviral treatment of Human Cytomegalovirus (HCMV) disease is a major goal in the management of organ transplant patients. It requires sensitive diagnostic methods. Automated real-time PCR systems have been recently proposed to monitor HCMV infection in such patients. OBJECTIVE: Objectives of this study was to compare a real-time quantitative PCR on whole blood with the HCMV pp65 antigenemia assay in renal transplant recipients, and also to evaluate two different DNA extraction methods. STUDY DESIGN: A total of 248 specimens from 21 patients were tested by quantitative pp65 antigenemia and quantitative real-time PCR. DNA was extracted from whole blood samples using two different methods: a conventional column manual assay and an automated system. RESULTS: Quantification of HCMV DNA using the two extraction methods showed highly similar results (Spearman rank test, r=0.863). We found a significant correlation between DNA quantification by real-time PCR in whole blood and pp65 antigenemia test (Spearman rank test, r=0.767). This correlation was not modified when the HCMV DNA results were normalized by quantification of the albumin cellular gene. In eight patients, HCMV infection was detected earlier with quantitative PCR than with the antigenemia test (mean delay of 11.25 days). HCMV DNA load equivalent of 50 pp65 positive cells/200,000 polymorphonuclear leukocytes (PMNLs) is log4.095 copies per ml of blood. CONCLUSIONS: Real-time PCR in whole blood is a sensitive method for estimating the HCMV genome load in renal transplant patients, and is more rapid and practicable than using PMNLs for pp65 antigenemia tests.

[Obstetrical complications of morbid obesity]. / Complications obstétricales de l'obésité morbide.

OBJECTIVE: To determine whether morbidly obese women have an increased risk of pregnancy complications and adverse perinatal outcome. METHODS: In a retrospective study, 2472 women with morbid obesity, defined as a body mass index (BMI) more than 40 were compared with normal weight women (BMI 20-25). Fisher and Student tests were used for statistical analysis. RESULTS: In the group of morbidly obese mothers (BMI greater than 40) as compared with the normal weight mothers, there was an increased risk of the following outcomes: gravidic hypertension (7.7 vs 0.5%; p<0.05). preeclampsia (11.5 vs 2%; p<0.05), gestational diabetes (15.4 vs 1.8%; p<0.05), cesarean delivery (50 vs 15.4%; p<0.05), and macrosomia (42.3 vs 10.3%; p<0.05). However, we noted a lower rate of prematurity in the obese group (0 vs 11%). Even when morbidly obese women with preexisting diabetes and chronic hypertension were excluded from the analysis, significant differences in the perinatal outcomes still persisted. CONCLUSION: Morbid obesity appears to be an independent risk factor for perinatal and gestational complications.