Longitudinal study assessing the return of chloroquine susceptibility of Plasmodium falciparum in isolates from travellers returning from West and Central Africa, 2000-2011.

BACKGROUND: Chloroquine (CQ) was the main malaria therapy worldwide from the 1940s until the 1990s. Following the emergence of CQ-resistant Plasmodium falciparum, most African countries discontinued the use of CQ, and now promote artemisinin-based combination therapy as the first-line treatment. This change was generally initiated during the last decade in West and Central Africa. The aim of this study is to describe the changes in CQ susceptibility in this African region, using travellers returning from this region as a sentinel system. METHODS: The study was conducted by the Malaria National Reference Centre, France. The database collated the pfcrtK76T molecular marker for CQ susceptibility and the in vitro response to CQ of parasites from travellers' isolates returning from Senegal, Mali, Ivory Coast or Cameroon. As a proxy of drug pressure, data regarding CQ intake in febrile children were collated for the study period. Logistic regression models were used to detect trends in the proportions of CQ resistant isolates. RESULTS: A total of 2874 parasite isolates were genotyped between 2000-2011. The prevalence of the pfcrt76T mutant genotype significantly decreased for Senegal (from 78% to 47%), Ivory Coast (from 63% to 37%), Cameroon (from 90% to 59%) and remained stable for Mali. The geometric mean of the 50% inhibitory concentration (IC50) of CQ in vitro susceptibility and the proportion of resistant isolates (defining resistance as an IC50 value > 100 nM) significantly decreased for Senegal (from 86 nM (59%) to 39 nM (25%)), Mali (from 84 nM (50%) to 51 nM (31%)), Ivory Coast (from 75 nM (59%) to 29 nM (16%)) and Cameroon (from 181 nM (75%) to 51 nM (37%)). Both analyses (molecular and in vitro susceptibility) were performed for the 2004-2011 period, after the four countries had officially discontinued CQ and showed an accelerated decline of the resistant isolates for the four countries. Meanwhile, CQ use among children significantly deceased in this region (fixed effects slope = -0.3, p < 10-3). CONCLUSIONS: An increase in CQ susceptibility following official withdrawal of the drug was observed in travellers returning from West and Central African countries. The same trends were observed for molecular and in vitro analysis between 2004-2011 and they correlated to the decrease of the drug pressure.

[Epidemiology of tinea capitis. Five-year retrospective study in three hospitals in the Val de Marne]. / Epidémiologie des teignes du cuir chevelu. Etude rétrospective sur 5 ans dans 3 centres hospitaliers du Val-de-Marne.

OBJECTIVE: Describe the epidemiology of Tinea capitis in three hospitals in the Val de Marne (suburban district southeast of Paris) and evaluate the usefulness of screening the families of index cases. METHODS: The study included 3 hospitals: Henri Mondor Hospital, Creteil Intermunicipal Hospital Center and Bicêtre Hospital. Index patients had a positive culture for dermatophytes during visits to the mycology-dermatology or pediatric clinics from January 1998 through December 2002. The diagnostic procedure was identical in all centers. In two centers, scalp samples were taken routinely from family members, even in the absence of clinical lesions. Species were identified according to the phenotypic features of the cultures. We recorded the age, sex, and geographic origin of each patient, when available. RESULTS: Samples were obtained from 487 outpatients (including family members): 383 were positive (356 children under 16 years, 27 adults). Of the children with positive cultures, 214 were boys (60%); of the adults, 18 (66%) were women. Distribution of geographic origin was: sub-Saharan Africa (71%), Europe (10%), Caribbean (5%) and North Africa (4,7%). Species identification confirmed the predominance of anthropophilic species, with 46% of the isolates Trichophyton soudanense and 33% Microsporum langeronii. T. violaceum was reported in 5.5% of cases and T. tonsurans in 2.8%. M. canis (9%), found in 34 Europeans, was the main zoophilic species. Family screening accounted for 263 of the 487 outpatients. Of 242 children from 86 families, 153 (63%) had positive cultures. Of the 21 parents, 5 had a positive culture. Globally, the family screening identified 158 cases in 263 tests (60%). CONCLUSION: Tinea capitis in the Val de Marne is mainly due to anthropophilic species and involves children of African origin. The frequency of family contamination indicates that routine screening of family members of infected children is valuable.

Frequency of intravascular catheter colonization by Malassezia spp. in adult patients.

Colonization of intravascular catheters (IVCs) with lipid-dependent Malassezia spp. is rarely reported in adult patients probably because of the absence of additional lipids in routine culture media. Therefore, we systematically seeded 983 consecutive IVC onto Dixon medium compatible with the growth of Malassezia spp. Seven (0.7%) IVCs were positive. Six of them were from surgical patients. Four of them also yielded common bacteria. Identification using PCR-RFLP and restriction enzymes yielded M. furfur and M. sympodialis. Colonization of IVCs with Malassezia spp. does not appear negligible and warrants additional studies to evaluate the clinical relevance of such findings and the role of this yeast in biofilm formation.