Search PubMed⌕ Search

Biomedical subjects

Didier Guillemot

Publications and source records attributed to Didier Guillemot.

At least 19 recordsLinked to original sources

National campaigns to improve antibiotic use.

High levels of antibiotic consumption are driving levels of bacterial resistance that threaten public health. Nonetheless, antibiotics still provide highly effective treatments for common diseases with important implications for human health. The challenge for public education is to achieve a meaningful reduction in unnecessary antibiotic use without adversely affecting the management of bacterial infections. This paper focuses on the lessons learned from national campaigns in countries (Belgium and France) with high antibiotic use. Evaluation of these national campaigns showed the importance of television advertising as a powerful medium to change attitudes and perhaps also behaviour with regard to antibiotics. Moreover, in both countries, strong evidence suggested reduced antibiotic prescribing. However, adverse effects associated with a reduction in antibiotic prescribing were not monitored. We conclude that carefully designed mass education campaigns could improve antibiotic use nationally and should be considered in countries with high antibiotic use. However, these campaigns should employ techniques of social marketing and use appropriate outcome measures. The benefits and risks of such campaigns have been less well established in countries where antibiotic use is already low or declining.

Anti-Bacterial Agents↗

S. pneumoniae transmission according to inclusion in conjugate vaccines: Bayesian analysis of a longitudinal follow-up in schools.

BACKGROUND: Recent trends of pneumococcal colonization in the United States, following the introduction of conjugate vaccination, indicate that non-vaccine serotypes tend to replace vaccine serotypes. The eventual extent of this replacement is however unknown and depends on serotype-specific carriage and transmission characteristics. METHODS: Here, some of these characteristics were estimated for vaccine and non-vaccine serotypes from the follow-up of 4,488 schoolchildren in France in 2000. A Bayesian approach using Markov chain Monte Carlo data augmentation techniques was used for estimation. RESULTS: Vaccine and non-vaccine serotypes were found to have similar characteristics: the mean duration of carriage was 23 days (95% credible interval (CI): 21, 25 days) for vaccine serotypes and 22 days (95% CI: 20, 24 days) for non-vaccine serotypes; within a school of size 100, the Secondary Attack Rate was 1.1% (95% CI: 1.0%, 1.2%) for both vaccine and non-vaccine serotypes. CONCLUSION: This study supports that, in 3-6 years old children, no competitive advantage exists for vaccine serotypes compared to non-vaccine serotypes. This is an argument in favour of important serotype replacement. It would be important to validate the result for infants, who are known to be the main reservoir in maintaining transmission. Overall reduction in pathogenicity should also be taken into account in forecasting the future burden of pneumococcal colonization in vaccinated populations.

Bayes Theorem↗

Testing independence between two Poisson-generated multinomial variables in case-series and cohort studies.

In case-series or cohort studies, we propose a test of independence between the occurrences of two types of recurrent events (such as two repeated infections) related to an intermittent exposure (such as an antibiotic treatment). The test relies upon an extension of a recent method for analysing case-series data, in the presence of one type of recurrent event. The test statistic is derived from a bivariate Poisson generated-multinomial distribution. Simulations for checking the validity of the test concerning the type I error and the power properties are presented. The test is illustrated using data from a cohort on antibiotics bacterial resistance in schoolchildren.

Anti-Bacterial Agents↗

[Infectious diseases risk management].

Surveillance activities first target health problems for which treatment, effective prevention or control measures are available. The data produced by surveillance systems allow prioritising public health actions and defining the objectives of infectious diseases control or prevention. The surveillance of infectious diseases relies on a large number of partners grouped in a public health network in which clinicians have a prominent role. In France, the surveillance of infectious diseases is based on mandatory notification of some diseases, national reference centers, networks of voluntary health professionals and repeated surveys, alerting health authorities in case of threats and identifying the determinants of changes in the population health's status. At hospital, the infectious risk is significant and the risk of epidemic outbreaks very high. A solid system for surveillance is mandatory. An educational program is needed to define the prevention program based on the use of hand disinfection and other standard precautions, antiviral and pneumococcal vaccination. A strong cooperation between general practitioners, healthcare team and relatives is necessary.

Anti-Bacterial Agents↗

Reduction of antibiotic use in the community reduces the rate of colonization with penicillin G-nonsusceptible Streptococcus pneumoniae.

BACKGROUND: There is a lack of evidence documenting the impact of optimized antibiotic use on the rates of colonization with penicillin G-nonsusceptible Streptococcus pneumoniae (PNSP) in children. This study evaluates the effect of community-based intervention strategies on the prevalence of pnsp colonization. METHODS: A controlled, population-based pharmacoepidemiological trial was conducted from January through May 2000. Three French geographic areas were selected on the basis of demographic similarities. Two intervention strategies were implemented: (1) reduced antibiotic use, which was achieved by not prescribing antibiotics for presumed viral respiratory tract infections (the prescription-reduction group); and (2) better adaptation of dose and duration (the dose/duration group). A control group received no intervention. The target population was children aged 3-6 years who were attending kindergarten. Oropharyngeal pneumococcus colonization and antibiotic use were monitored throughout the 5-month study. RESULTS: The prescription-reduction, dose/duration, and control groups included 601, 483, and 405 children, respectively. The interventions induced significantly larger decreases in antibiotic use in the prescription-reduction group (-18.8%) and dose/duration group (-17.1%) than in the control group (-3.8%), and the rates of PNSP colonization were initially similar for the 3 groups (52.5%, 55.1%, and 50.0%, respectively). At the end of the 5-month study, the rates of PNSP colonization were 34.5% for the prescription-reduction group (P=.05) and 44.3% for the dose/duration group (P=.8), compared with 46.2% for the control group. CONCLUSIONS: Intensive educational strategies aimed at optimizing antibiotic use can significantly reduce the rate of PNSP colonization in areas with high resistance rates.

Anti-Bacterial Agents↗

Spread of a Klebsiella pneumoniae strain producing a plasmid-mediated ACC-1 AmpC beta-lactamase in a teaching hospital admitting disabled patients.

We describe a large outbreak involving a Klebsiella pneumoniae strain producing a plasmid-encoded ACC-1 type AmpC beta-lactamase in a hospital caring for patients with motor impairment. The epidemic strain was isolated from 57 patients in six wards between September 1999 and May 2003 and caused clinical infections in 19 patients.

Adolescent↗

Age-related prevalence and distribution of nontuberculous mycobacterial species among patients with cystic fibrosis.

We studied the prevalence and species distribution of nontuberculous mycobacteria (NTM) in relation to age in 385 patients with cystic fibrosis (CF) (mean age +/- standard deviation [range], 12.0 +/- 6.1 [1 to 24] years; sex ratio, 0.53) attending three Parisian centers. The overall prevalence of NTM in sputum was 8.1% (31 out of 385). The following NTM were isolated (n = 33): Mycobacterium abscessus (n = 13, 39.4%), Mycobacterium avium complex (MAC) (n = 7, 21.2%), Mycobacterium gordonae (n = 6, 18.2%), and other (n = 7, 21.2%). Sixteen patients met the American Thoracic Society microbiological criteria for NTM infection, including 11 patients positive for M. abscessus, 4 for MAC, and 1 for MAC and Mycobacterium kansasii. The overall prevalence of NTM was significantly lower in patients under 15 years old than for patients equal to or more than 15 years old (4.8 versus 14.9%, respectively; P = 0.001). M. abscessus was isolated at all ages, while MAC was not recovered before 15 years (prevalence of 0.0 and 5.2% in patients aged 1 to 14 and 15 to 24, respectively; P = 0.001).

Adolescent↗

Measurement of immunoglobulin G against Mycobacterial antigen A60 in patients with cystic fibrosis and lung infection due to Mycobacterium abscessus.

BACKGROUND: The diagnosis and prognosis of lung infections due to the emerging nontuberculous mycobacterium (NTM) Mycobacterium abscessus are difficult to establish in children with cystic fibrosis. METHODS: We evaluated the usefulness of an enzyme-linked immunosorbent assay for detecting serum IgG antibodies against the ubiquitous mycobacterial antigen A60. RESULTS: A total of 186 patients with cystic fibrosis (mean age+/-SD, 12.0+/-5.0 years) were studied, including 15 M. abscessus-positive patients who fulfilled American Thoracic Society (ATS) criteria for NTM infection (M. abscessus-infected patients), 7 M. abscessus-positive patients who did not fulfill ATS criteria, 20 patients positive for various other NTM who did not fulfill ATS criteria, and 144 NTM-negative control patients; mean IgG titers (+/-SD) for these 4 groups were 718+/-342 U, 193+/-113 U, 129+/-49 U, and 121+/-53 U, respectively (M. abscessus-infected patients vs. each of the other groups, P<.005). The A60 IgG test was both sensitive (approximately 87%) and specific (approximately 95%) if adapted cutoff values were used (150 U and 250 U for patients aged 10 years, respectively) and correlated well with results of acid-fast bacilli smears. CONCLUSION: Measurement of anti-A60 IgG may be useful for both the diagnosis and assessment of activity of M. abscessus lung infection in persons with cystic fibrosis.

Anti-Bacterial Agents↗

No significant decrease in antibiotic use from 1992 to 2000, in the French community.

OBJECTIVES: To analyse trends in antibiotic exposure of the French population from 1992 to 2000. METHODS: The analysis used data provided by a representative annual nationwide survey of health care consumption in the community. RESULTS: The frequency of antibiotic use increased from 4.7 per 100 person-months in 1992 to 7.3 in 1995, and remained stable from 1998 to 2000. Children under 7 years of age were three times more strongly exposed to antibiotics than older subjects. Respiratory tract infections of probable viral aetiology and sore throat accounted for >50% of antibacterial prescriptions. CONCLUSIONS: We identified two major priorities for campaigns designed to reduce antibiotic exposure of the French population in the community, namely respiratory tract infections of presumed viral origin, and children under 7 years of age.

Adolescent↗

Amoxicillin-clavulanate therapy increases childhood nasal colonization by methicillin-susceptible Staphylococcus aureus strains producing high levels of penicillinase.

We examined factors associated with penicillinase production by nasal carriage Staphylococcus aureus strains in 648 children aged 3 to 6 years attending 20 randomly sampled playschools. The children were prospectively monitored for drug use and medical events for 6 months and were then screened for S. aureus carriage. Isolates were tested for their susceptibility to penicillin G and methicillin, and penicillinase production by methicillin-susceptible, penicillin-resistant strains was quantified. S. aureus was isolated from 166 children (25.6%). Exposure to amoxicillin-clavulanate during the previous 3 months was associated with higher penicillinase production by penicillin-resistant, methicillin-susceptible strains (odds ratio, 3.6; P = 0.03). These results suggest that use of the amoxicillin-clavulanate combination could induce a herd selection process of S. aureus strains producing higher levels of penicillinase.

Amoxicillin-Potassium Clavulanate Combination↗

Antibacterial resistance, Wayampis Amerindians, French Guyana.

Drug resistance in fecal bacteria was high in Wayampis Amerindians who did not take antibacterial agents and were not hospitalized for 1 year. In the Wayampis Amerindians, an isolated traditional community in French Guyana, antibacterial use was 0.64 treatments per person per year. Hospitalization rate was 6.1% per year. Antibacterial drug-resistant bacteria can spread in persons who are not taking antibacterial agents.

Adolescent↗

Mycobacterium abscessus and children with cystic fibrosis.

We prospectively studied 298 patients with cystic fibrosis (mean age 11.3 years; range 2 months to 32 years; sex ratio, 0.47) for nontuberculous mycobacteria in respiratory samples from January 1, 1996, to December 31, 1999. Mycobacterium abscessus was by far the most prevalent nontuberculous mycobacterium: 15 patients (6 male, 9 female; mean age 11.9 years; range 2.5-22 years) had at least one positive sample for this microorganism (versus 6 patients positive for M. avium complex), including 10 with >3 positive samples (versus 3 patients for M. avium complex). The M. abscessus isolates from 14 patients were typed by pulsed-field gel electrophoresis: each of the 14 patients harbored a unique strain, ruling out a common environmental reservoir or person-to-person transmission. Water samples collected in the cystic fibrosis center were negative for M. abscessus. This major mycobacterial pathogen in children and teenagers with cystic fibrosis does not appear to be acquired nosocomially.

Adolescent↗

Evolution of antimicrobial resistance: impact on antibiotic use.

During the past 50 years, the permanent increase in bacterial resistance to antibiotics has led to modifications in therapeutic recommendations. Despite evidence that antimicrobial exposure of human populations is the most important driving force for the continuous increase in bacterial resistance, the studies of the impact of bacterial resistance on antibiotic use have, during the past, focused on clinical efficacy of individual treatments rather than on collective control of resistance. There are current changes in this attitude, mainly in hospitals, probably because hospital prescribers have experienced the consequences of resistance on their patients. However, in the community such an awareness is not likely to develop in the near future. Therefore, there is a need for public health decision makers to become more involved in prevention of the impact of resistance in antibiotic use.

Journal Article↗

[Avoidable hospital drug prescription in the elderly. A review of the literature].

Elderly persons are particularly exposed to drug reactions, especially drug interactions subsequent to multiple prescriptions. It is also recognized that the drug risk is the leading hospital risk involving 1 to 10% of all hospitalized patients. An analysis of the avoidable nature of drug reactions leads to consideration of a sequence of 4 events leading to drug exposure: prescription, delivery, administration and compliance. Each event in this sequence corresponds to a distinct person: physician, pharmacist, nurse, patient. This suggests that the prevention of drug reactions in hospitalized elderly persons requires implementation of an "alert-causal attributability-avoidability-prevention" system by the healthcare teams where physicians, pharmacists, and nurses work in close coordination with the patient.

Aged↗