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Moussa M, De Jonckheere JF, Guerlotté J, Richard V, Bastaraud A, Romana M, Talarmin A. Survey of Naegleria fowleri in geothermal recreational waters of Guadeloupe (French West Indies). PLoS One 2013; 8:e54414. [PMID: 23349880 PMCID: PMC3548798 DOI: 10.1371/journal.pone.0054414] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Accepted: 12/12/2012] [Indexed: 11/18/2022] Open
Abstract
In 2008 a fatal case of primary amoebic meningoencephalitis, due to the amoeboflagellate Naegleria fowleri, occurred in Guadeloupe, French West Indies, after a child swam in a bath fed with geothermal water. In order to improve the knowledge on free-living amoebae in this tropical part of France, we investigated on a monthly basis, the presence of Naegleria spp. in the recreational baths, and stream waters which feed them. A total of 73 water samples, 48 sediments and 54 swabs samples were collected from 6 sampling points between June 2011 and July 2012. The water samples were filtered and the filters transferred to non-nutrient agar plates seeded with a heat-killed suspension of Escherichia coli while sediment and swab samples were placed directly on these plates. The plates were incubated at 44°C for the selective isolation of thermophilic Naegleria. To identify the Naegleria isolates the internal transcribed spacers, including the 5.8S rDNA, were amplified by polymerase chain reaction and the sequence of the PCR products was determined. Thermophilic amoebae were present at nearly all collection sites. The pathogenic N. fowleri was the most frequently encountered thermophilic species followed by N. lovaniensis. The concentration of N. fowleri was rather low in most water samples, ranging from 0 to 22 per liter. Sequencing revealed that all N. fowleri isolates belonged to a common Euro-American genotype, the same as detected in the human case in Guadeloupe. These investigations need to be continued in order to counsel the health authorities about prevention measures, because these recreational thermal baths are used daily by local people and tourists.
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Randremanana R, Randrianirina F, Gousseff M, Dubois N, Razafindratsimandresy R, Hariniana ER, Garin B, Randriamanantena A, Rakotonirina HC, Ramparany L, Ramarokoto CE, Rakotomanana F, Ratsitorahina M, Rajatonirina S, Talarmin A, Richard V. Case-control study of the etiology of infant diarrheal disease in 14 districts in Madagascar. PLoS One 2012; 7:e44533. [PMID: 23028555 PMCID: PMC3444445 DOI: 10.1371/journal.pone.0044533] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2012] [Accepted: 08/03/2012] [Indexed: 02/04/2023] Open
Abstract
Background Acute diarrhea is a major cause of childhood morbidity and mortality worldwide. Its microbiological causes and clinico-epidemiological aspects were examined during the rainy seasons from 2008 to 2009 in 14 districts in Madagascar. Methods Stool specimens of 2196 children with acute diarrhea and 496 healthy children were collected in a community setting. Intestinal parasites were diagnosed by microscopy and bacteria by culturing methods. Rota-, astro and adenoviruses were identified using commercially available ELISA kits and rotaviruses were confirmed using reverse transcriptase polymerase chain reaction (RT-PCR). Results Intestinal microorganisms were isolated from 54.6% of diarrheal patients and 45.9% of healthy subjects (p = <0.01). The most common pathogens in diarrheic patients were intestinal parasites (36.5%). Campylobacter spp. and Rotavirus were detected in 9.7% and 6.7% of diarrheic patients. The detection rates of Entamoeba histolytica, Trichomonas intestinalis and Giardia lamblia were much greater in diarrheal patients than in non diarrheal subjects (odds ratios of 5.1, 3.2, 1.7 respectively). The abundance of other enteropathogens among the non diarrheal group may indicate prolonged excretion or limited pathogenicity. Conclusion In developing countries, where the lack of laboratory capacities is great, cross sectional studies of enteropathogens and their spatial distribution, including diarrheal and non diarrheal subjects, are interesting tools in order to advise regional policies on treatment and diarrheic patient management.
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Raharimanga V, Ratovoson R, Ratsitorahina M, Ramarokoto H, Rasolofo V, Talarmin A, Richard V. Tuberculin reactivity in first-year schoolchildren in Madagascar. Trop Med Int Health 2012; 17:871-6. [PMID: 22620713 DOI: 10.1111/j.1365-3156.2012.03013.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE The tuberculin skin test (TST) is an important tool in the diagnosis of tuberculosis infection in children. However, the interpretation of TST may be complicated by prior Bacillus Calmette-Guerin (BCG) vaccination. We evaluated the effect of vaccination with BCG on TST reactivity in first-year pupils attending state schools in Antananarivo. METHODS STs were performed on 376 first-year schoolchildren, aged 6 and 7, attending two state primary schools. The relationships between epidemiological information, BCG status (vaccination, BCG scars) and TST reactivity were assessed to compare TST sensitivity between children with and without BCG vaccination and between those with and without a BCG scar. RESULT The prevalence of positive TST results of ≥5, ≥10 and ≥ 15 mm was 20.2% (76/376), 18.3% (69/376) and 11.4% (43/376), respectively. BCG vaccination was not associated with TST reactivity, whatever the threshold used: ≥5 mm (odds ratio (OR, 1.2; 95% confidence interval (CI), 0.7-2.0); ≥10 mm (OR, 0.9; 95% CI, 0.6-1.7); ≥15 mm (OR, 0.6; 95% CI, 0.3-1.2). CONCLUSION These results suggest that in Madagascar, a positive TST result indicates TB infection (active or latent) rather than past BCG vaccination. Therefore, high BCG vaccination coverage does not appear to impair the usefulness of the TST as a tool for diagnosing tuberculosis.
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Herindrainy P, Randrianirina F, Ratovoson R, Ratsima Hariniana E, Buisson Y, Genel N, Decré D, Arlet G, Talarmin A, Richard V. Rectal carriage of extended-spectrum beta-lactamase-producing gram-negative bacilli in community settings in Madagascar. PLoS One 2011; 6:e22738. [PMID: 21829498 PMCID: PMC3146483 DOI: 10.1371/journal.pone.0022738] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2010] [Accepted: 07/06/2011] [Indexed: 11/21/2022] Open
Abstract
Background Extended-spectrum ß-lactamase-producing Enterobacteria (ESBL-PE) emerged at the end of the 1980s, causing nosocomial outbreaks and/or hyperendemic situations in hospitals and long-term care facilities. In recent years, community-acquired infections due to ESBL-PE have spread worldwide, especially across developing countries including Madagascar. Objectives This study aimed to determine the prevalence and risk factors of intestinal carriage of ESBL-PE in the community of Antananarivo. Methods Non-hospitalized patients were recruited in three health centers in different socio economic settings. Fresh stool collected were immediately plated on Drigalski agar containing 3 mg/liter of ceftriaxone. Gram-negative bacilli species were identified and ESBL production was tested by a double disk diffusion (cefotaxime and ceftazidime +/− clavulanate) assay. Characterization of ESBLs were perfomed by PCR and direct sequencing . Molecular epidemiology was analysed by Rep-PCR and ERIC-PCR. Results 484 patients were screened (sex ratio = 1.03, median age 28 years). 53 ESBL-PE were isolated from 49 patients (carrier rate 10.1%). The isolates included Escherichia coli (31), Klebsiella pneumoniae (14), Enterobacter cloacae (3), Citrobacter freundii (3), Kluyvera spp. (1) and Pantoae sp.(1). In multivariate analysis, only the socioeconomic status of the head of household was independently associated with ESBL-PE carriage, poverty being the predominant risk factor. Conclusions The prevalence of carriage of ESBL in the community of Antananarivo is one of the highest reported worldwide. This alarming spread of resistance genes should be stopped urgently by improving hygiene and streamlining the distribution and consumption of antibiotics.
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Andriatahina T, Randrianirina F, Hariniana ER, Talarmin A, Raobijaona H, Buisson Y, Richard V. High prevalence of fecal carriage of extended-spectrum beta-lactamase-producing Escherichia coli and Klebsiella pneumoniae in a pediatric unit in Madagascar. BMC Infect Dis 2010; 10:204. [PMID: 20624313 PMCID: PMC2912907 DOI: 10.1186/1471-2334-10-204] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2009] [Accepted: 07/12/2010] [Indexed: 12/04/2022] Open
Abstract
Background Extended-spectrum β-lactamase (ESBL)-producing Enterobacteriaceae have spread worldwide but there are few reports on carriage in hospitals in low-income countries. ESBL-producing Enterobacteriaceae (ESBL-PE) have been increasingly isolated from nosocomial infections in Antananarivo, Madagascar. Methods we conducted a prevalence survey in a pediatric unit from March to April 2008 Patient rectal swabs were sampled on the first and the last day of hospitalization. Medical staff and environment were also sampled. Rectal and environmental swabs were immediately plated onto Drigalski agar supplemented with 3 mg/liter of ceftriaxon. Results Fecal carriage was detected in 21.2% of 244 infants on admission and 57.1% of 154 on discharge, after more than 48 hours of hospitalization (p < 0.001). The species most frequently detected on admission were Escherichia coli and Klebsiella pneumoniae (36.9%), whereas, on discharge, K. pneumoniae was the species most frequently detected (52.7%). ESBL-associated resistances were related to trimethoprim-sulfamethoxazole (91.3%), gentamicin (76.1%), ciprofloxacin (50.0%), but not to amikacin and imipenem. The increased prevalence of carriage during hospitalization was related to standard antimicrobial therapy. Conclusion The significant emergence of multidrug-resistant enteric pathogens in Malagasy hospitals poses a serious health threat requiring the implementation of surveillance and control measures for nosocomial infections.
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Andriamanantena TS, Ratsima E, Rakotonirina HC, Randrianirina F, Ramparany L, Carod JF, Richard V, Talarmin A. Dissemination of multidrug resistant Acinetobacter baumannii in various hospitals of Antananarivo Madagascar. Ann Clin Microbiol Antimicrob 2010; 9:17. [PMID: 20591154 PMCID: PMC2910008 DOI: 10.1186/1476-0711-9-17] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2009] [Accepted: 06/30/2010] [Indexed: 11/10/2022] Open
Abstract
This study reports the dissemination of multidrug-resistant (MDR) OXA-23-producing Acinetobacter baumannii clones in hospitals in Antananarivo, Madagascar. A total of 53 carbapenem-resistant A. baumannii isolates were obtained from September 2006 to March 2009 in five hospitals. These resistant strains represent 44% of all A. baumannii isolates. The double disk synergy test was performed to screen for production of metallo-beta-lactamases. Polymerase chain reaction (PCR) and DNA sequencing were performed for the detection of bla(AmpC), bla(OXA-51),bla(OXA-23), bla(OXA-24), bla(IMP), bla(VIM). The presence of the insertion sequence ISAba1 relative to blaOXA-23 and blaOXA-51 was assessed by PCR. Isolates were typed by Rep-PCR. All the isolates were MDR and produced the OXA-23 carbapenemase, which was confirmed by sequencing. PCR analysis for AmpC and OXA-51 gave positive results for all strains studied. No isolates produced metallo-beta-lactamases. In all isolates ISAba1 laid upstream of blaOXA-23. The A. baumannii isolates were separated into two genotypes; genotype A had a higher prevalence (41 strains) than genotype B (12 strains). Genotype A was present in four hospitals, whilst genotype B had spread in two hospitals. The high frequency of MDR OXA-23-producing A. baumannii in various hospitals in Antananarivo is curious since carbapenems are not available in Madagascar, but it emphasises the need for infection control procedures and strict adherence to them to prevent the spread of these resistant organisms in Antananarivo and also the need to control the use of carbapenems in the future.
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Randrianirina F, Vaillant L, Ramarokoto CE, Rakotoarijaona A, Andriamanarivo ML, Razafimahandry HC, Randrianomenjanahary J, Raveloson JR, Hariniana ER, Carod JF, Talarmin A, Richard V. Antimicrobial resistance in pathogens causing nosocomial infections in surgery and intensive care units of two hospitals in Antananarivo, Madagascar. J Infect Dev Ctries 2010; 4:74-82. [PMID: 20212337 DOI: 10.3855/jidc.454] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2009] [Revised: 11/03/2009] [Accepted: 11/10/2009] [Indexed: 10/31/2022] Open
Abstract
BACKGROUND In developing countries, knowledge of antimicrobial resistance patterns is essential to define empirical therapy. METHODOLOGY All the surgery and intensive care wards of two hospitals in Antananarivo were included to study the antimicrobial susceptibility of the pathogenic bacteria causing nosocomial infections. A repeated cross-sectional survey was conducted between September 2006 and March 2008, one day per week. Isolates were identified using classical methods, and resistance to antibiotics was assessed according to the recommendations of the Antibiogram Committee of the French Microbiology Society. RESULTS Clinical specimens from 706 from 651 patients were collected. Of the 533 bacterial pathogens, 46.7% were Enterobacteriaceae, 19.3% were Staphylococcus aureus, and 19.1% were pathogens from the hospital environment (Pseudomonas aeruginosa and Acinetobacter baumannii).Frequencies of resistance were high, particularly in Enterobacteriaceae; however, the rate of Staphylococcus aureus isolates resistant to oxacillin (13.6 %) was moderate and all these isolates were susceptible to glycopeptids. The percentages of isolates susceptible to ceftazidim were 81.8% for E. coli, 60.9% for Klebsiella, and 52.5% for Enterobacter spp. Resistance to third-generation cephalosporins was due to extended spectrum betalactamases (ESBL). Multivariate analysis showed that diabetes (adjusted OR: 3.9) and use of an invasive procedures (adjusted OR: 3.5) were independent risk factors for resistance to third-generation cephalosporins. CONCLUSION A nationwide surveillance programme is needed to monitor the microbial trends and antimicrobial resistance in Madagascar.
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Randrianirina F, Vedy S, Rakotovao D, Ramarokoto CE, Ratsitohaina H, Carod JF, Ratsima E, Morillon M, Talarmin A. Role of contaminated aspiration tubes in nosocomial outbreak of Klebsiella pneumoniae producing SHV-2 and CTX-M-15 extended-spectrum beta-lactamases. J Hosp Infect 2009; 72:23-9. [PMID: 19282056 DOI: 10.1016/j.jhin.2009.02.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2008] [Accepted: 02/04/2009] [Indexed: 10/21/2022]
Abstract
Klebsiella pneumoniae resistant to ceftazidime was isolated from ten neonates hospitalised between February and March 2006 in two Antananarivo hospitals, Madagascar. The main environmental source, for one hospital in particular, was the liquid used to rinse aspiration tubes in the paediatric wards. The risk of contamination from aspiration tubes is very high in the hospitals of Antananarivo since tap water used to rinse the tubes is not regularly changed. Phenotypical (biotyping and antibiotyping) and genotypical (pulsed-field gel electrophoresis) analysis of all the clinical isolates indicated that nine cases were due to a single clone. This clone carried the genes encoding SHV-2 and CTX-M-15 beta-lactamases. This is the first description of an epidemic due to an ESBL-producing member of the family Enterobacteriaceae in Malagasy hospitals.
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Alcon-LePoder S, Sivard P, Drouet MT, Talarmin A, Rice C, Flamand M. Secretion of flaviviral non-structural protein NS1: from diagnosis to pathogenesis. NOVARTIS FOUNDATION SYMPOSIUM 2008; 277:233-47; discussion 247-53. [PMID: 17319166 DOI: 10.1002/0470058005.ch17] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Flaviviruses are major arthropod-borne human pathogens responsible for life-threatening encephalitis, hepatitis and haemorrhagic fevers. These enveloped, single-stranded, positive-sense RNA viruses encode a polyprotein precursor of about 3400 amino acids, processed into three structural and seven non-structural proteins. The non-structural glycoprotein NS1 is essential for flavivirus viability. During host-cell infection in vitro, NS1 is found associated with intracellular organelles as a requisite for its role in viral replication, or is transported to the cell surface where it may trigger specific signalling pathways. In addition, a secreted form of the protein is released from flavivirus-infected mammalian cells. We have previously shown that the NS1 protein circulates during the acute phase of the disease in the plasma of patients infected with dengue virus type 1 and have extended our retrospective studies to dengue type 2 and type 3 cohorts, confirming the value of the NS1 antigen as an alternative diagnostic marker. Interestingly, detection of the NS1 protein in yellow fever virus and West Nile virus infections suggests that NS1 secretion is a hallmark of human flavivirus infections. The objectives of our current studies are to define the biological properties of the secreted form of the NS1 protein, to evaluate its possible contribution to viral pathogenesis, and to validate this protein as a candidate target for passive immunoprophylaxis against flaviviruses.
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Ratsitorahina M, Harisoa J, Ratovonjato J, Biacabe S, Reynes JM, Zeller H, Raoelina Y, Talarmin A, Richard V, Louis Soares J. Outbreak of dengue and Chikungunya fevers, Toamasina, Madagascar, 2006. Emerg Infect Dis 2008; 14:1135-7. [PMID: 18598641 PMCID: PMC2600361 DOI: 10.3201/eid1407.071521] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
An outbreak of dengue-like syndrome occurred in Toamasina from January through March 2006. Dengue type l or chikungunya viruses were detected in 38 of 55 patients sampled. Aedes albopictus was the only potential vector collected. Of 4,242 randomly selected representative residents interviewed retrospectively, 67.5% reported a dengue-like syndrome during this period.
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Raharimanga V, Carod JF, Ramarokoto CE, Chrétien JB, Rakotomanana F, Talarmin A, Richard V. Age-specific seroprevalence of hepatitis A in Antananarivo (Madagascar). BMC Infect Dis 2008; 8:78. [PMID: 18538023 PMCID: PMC2435538 DOI: 10.1186/1471-2334-8-78] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2008] [Accepted: 06/06/2008] [Indexed: 11/19/2022] Open
Abstract
Background Hepatitis A virus (HAV) is an enteric, viral, infectious disease endemic in many developing countries such as Madagascar. Infection is often subclinical or asymptomatic in children; however, symptomatic acute infections become more common with increasing age. In some developing countries, improvements in living conditions have led to changes in the epidemiological pattern of HAV infection. There are very few reports on the prevalence of HAV in Madagascar. This study was to determine the seroprevalence of hepatitis A virus antibodies in relation to age in the city of Antananarivo, Madagascar. Methods Serum samples collected in 2004 during a cross-sectional survey of individuals aged between two and 24 years from Antananarivo were tested for anti-HAV antibody using a commercial enzyme immunoassay kit. Subjects were investigated using a standardized social and medical history questionnaire. Results 926 subjects were enrolled including 406 males and 520 females. There were 251 children under 10 years old and 675 subjects between 10 and 24 years old. Of the 926 serum samples tested, 854 (92.2%) were positive for anti-HAV antibodies. The number of seropositive samples was similar for males and females. The overall seroprevalence was 83.7% (210/251) for children under 10 years old and 95.5% (644/675) for subjects aged between 10 and 24 years (p < 0.001). Conclusion Despite improvements in sanitary conditions and hygiene over the last few years, the prevalence of HAV in Antananarivo is high. Only children under five years old remain susceptible to HAV infection. Immunization against HAV is not needed at the present time in the Madagascan population, but should be recommended for travellers.
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Randrianirina F, Carod JF, Ratsima E, Chrétien JB, Richard V, Talarmin A. Evaluation of the performance of four rapid tests for detection of hepatitis B surface antigen in Antananarivo, Madagascar. J Virol Methods 2008; 151:294-297. [PMID: 18462816 DOI: 10.1016/j.jviromet.2008.03.019] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2007] [Revised: 03/18/2008] [Accepted: 03/19/2008] [Indexed: 12/17/2022]
Abstract
Four rapid immunochromatographic assays--Determine HBsAg, Virucheck HBsAg, Cypress HBsAg Dipstick and Hexagon HBsAg--for human hepatitis B surface antigen (HBsAg) detection in human serum were evaluated. A collection of reference serum samples (91 HBsAg positive and 109 HBsAg negative) stored at -80 degrees C was used. Sensitivity and positive predictive value (PPV) exceeded 95%, and specificity and negative predictive value (NPV) exceeded 96% for all tests. The Determine HBsAg test performed best in this study, with a sensitivity of 97.8%, a specificity and PPV of 100%, a NPV of 98.2% and an accuracy rate of 99.0%. However, the differences between the tests were not significant. Other factors should therefore also be taken into account by the Ministry of Health in its decision to recommend a particular test: price, availability, delivery time and feasibility of whole-blood testing. The Determine test appears to be the most suitable for Madagascar, based on all these criteria. The use of this test, despite its lower sensitivity, could prevent blood-borne transmission of hepatitis B virus (HBV) in areas with limited resources.
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Bekondi C, Olinger CM, Boua N, Talarmin A, Muller CP, Le Faou A, Venard V. Central African Republic is part of the West-African hepatitis B virus genotype E crescent. J Clin Virol 2007; 40:31-7. [PMID: 17689139 DOI: 10.1016/j.jcv.2007.05.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2007] [Revised: 04/25/2007] [Accepted: 05/21/2007] [Indexed: 12/12/2022]
Abstract
BACKGROUND Recent studies have shown that Hepatitis B virus (HBV) genotype E predominates in a vast crescent in West-Africa spanning from Senegal to Angola. OBJECTIVES To determine whether HBV strains in the Central African Republic (CAR) belong predominately to the homogeneous West-African genotype E or whether they are more closely related to genotypes found in East Africa. STUDY DESIGN Serum samples were randomly collected from 196 patients admitted with symptoms of acute or chronic hepatitis to the Central Hospital in Bangui. Thirty complete and 36 partial sequences of HBV strains were obtained. RESULTS Ninety-four percent (62/66) of the strains belonged to genotype E, while genotype A1, most closely related to a strain from Tanzania and genotype D were detected in only one and three samples, respectively. One strain presented a recombination between the S and X gene of a genotype E precursor and a partial PreC/C gene of a genotype D precursor. CONCLUSIONS Genotype E is predominant in CAR with little overlap with genotypes from Eastern Africa, extending the West-African HBV genotype E crescent further to the East.
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Randrianirina F, Soares JL, Ratsima E, Carod JF, Combe P, Grosjean P, Richard V, Talarmin A. In vitro activities of 18 antimicrobial agents against Staphylococcus aureus isolates from the Institut Pasteur of Madagascar. Ann Clin Microbiol Antimicrob 2007; 6:5. [PMID: 17521424 PMCID: PMC1891307 DOI: 10.1186/1476-0711-6-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2007] [Accepted: 05/23/2007] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Staphylococcus aureus, one of the most frequently isolated pathogens in both hospitals and the community, has been particularly efficient at developing resistance to antimicrobial agents. In developed countries, as methicillin-resistant S. aureus (MRSA) has prevailed and, furthermore, as S. aureus with reduced susceptibility to vancomycin has emerged, the therapeutic options for the treatment of S. aureus infections have become limited. In developing countries and especially African countries very little is known concerning the resistance of S. aureus to antibiotics. In Madagascar no data exist concerning this resistance. OBJECTIVE To update the current status of antibiotic resistance of S. aureus in Antananarivo, Madagascar. METHODS Clinical S. aureus isolates were collected from patients at the Institut Pasteur of Madagascar from January 2001 to December 2005. Susceptibility tests with 18 antibiotics were performed by the disk diffusion method. RESULTS Among a total of 574 isolates, 506 were from community-acquired infections and 68 from nosocomial infections. There was no significant difference in the methicillin resistance rate between community-acquired strains (33 of 506; 6.5%) and nosocomial strains (3 of 68, 4.4%). Many MRSA isolates were resistant to multiple classes of antibiotics. Resistance to tetracyclin, trimethoprim-sulfamethoxazole and erythromycin was more common. Among MRSA isolates resistance rates to rifampicin, fusidic acid, gentamicin and ciprofloxacin were lower than that observed with other drugs easily available in Madagascar. No isolates were resistant to glycopeptides. CONCLUSION The rate of methicillin-resistant S. aureus is not different between community-acquired and nosocomial infections and is still rather low in Madagascar.
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Frank T, Gautier V, Talarmin A, Bercion R, Arlet G. Characterization of sulphonamide resistance genes and class 1 integron gene cassettes in Enterobacteriaceae, Central African Republic (CAR). J Antimicrob Chemother 2007; 59:742-5. [PMID: 17350987 DOI: 10.1093/jac/dkl538] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
OBJECTIVES The aim of this study was to characterize genes encoding sulphonamide resistance and gene cassettes associated with class 1 integrons in trimethoprim-sulphamethoxazole resistant Enterobacteriaceae recovered from Bangui, Central African Republic (CAR). METHODS We studied 78 clinical Enterobacteriaceae isolates, including 16 extended-spectrum beta-lactamases producers, 10 Salmonella and 9 Shigella, resistant to trimethoprim-sulphamethoxazole as assessed by the disc diffusion method. PCR was used to test for sul1 and sul2 genes. Class 1 integron resistance gene cassettes were characterized by directly sequencing PCR products obtained with primers recognising 5' and 3' conserved regions. RESULTS The sul1 gene was found in 67 isolates, the sul2 gene in 72 isolates and both genes in 62 isolates, while the int1 gene was found in 74 isolates. The most prevalent dfr genes were dfrA7 (49%), dfrA1 (17%) and dfrA2d (13%). CONCLUSION These results illustrate the wide distribution of sulphonamide and trimethoprim resistance genes among Enterobacteriaceae in Bangui (CAR).
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Nouvel LX, Kassa-Kelembho E, Dos Vultos T, Zandanga G, Rauzier J, Lafoz C, Martin C, Blazquez J, Talarmin A, Gicquel B. Multidrug-resistant Mycobacterium tuberculosis, Bangui, Central African Republic. Emerg Infect Dis 2006; 12:1454-6. [PMID: 17073103 PMCID: PMC3298286 DOI: 10.3201/eid1209.060361] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
We investigated multidrug-resistant (MDR) Mycobacterium tuberculosis strains in Bangui, Central African Republic. We found 39.6% with the same spoligotype and synonymous single nucleotide polymorphism in the mutT1 gene. However, strains had different rpoB mutations responsible for rifampin resistance. MDR strains in Bangui may emerge preferentially from a single, MDR-prone family.
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Randrianirina F, Soares JL, Carod JF, Ratsima E, Thonnier V, Combe P, Grosjean P, Talarmin A. Antimicrobial resistance among uropathogens that cause community-acquired urinary tract infections in Antananarivo, Madagascar. J Antimicrob Chemother 2006; 59:309-12. [PMID: 17138569 DOI: 10.1093/jac/dkl466] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Urinary tract pathogens obtained from patients in Madagascar are becoming increasingly resistant to commonly used antibiotics that are readily available at a low price. This poses a real problem for the treatment of community-acquired urinary tract infections (UTIs) in Madagascar. OBJECTIVES To obtain data on the pathogens responsible for community-acquired UTIs in Antananarivo and on their susceptibility patterns to the antimicrobial agents that are currently used to treat UTIs. METHODS We conducted a retrospective study on bacteria isolated from the urine of patients at the Institut Pasteur of Madagascar between January 2004 and April 2006. RESULTS We isolated 903 pathogens from 673 women and 213 men. The most commonly isolated bacteria were Escherichia coli (607 strains), Klebsiella pneumoniae (87 strains), Staphylococcus aureus (35 strains) and Proteus mirabilis (32 strains). Seventy-seven per cent of Gram-negative bacilli were resistant to amoxicillin, 65.7% were resistant to trimethoprim/sulfamethoxazole and more than 15% were resistant to ciprofloxacin. Strains were rarely resistant to more expensive antibiotics (ceftriaxone 5.9%, fosfomycin 4.6%). Most bacteria showed intermediate susceptibility to nitroxolin. Resistance rates of E. coli to ceftriaxone and gentamicin increased significantly between 2005 and 2006, due to the increase in strains harbouring an extended-spectrum beta-lactamase. Gram-positive bacteria, Streptococcaceae and Staphylococcus spp. were rarely resistant, but 9.5% of streptococci were resistant to penicillin A and 8% of staphylococci were resistant to oxacillin. CONCLUSIONS The rate of amoxicillin- and trimethoprim/sulfamethoxazole-resistant Enterobacteriaceae implies that another antibiotic should be used for empirical treatment and that there is a need for new generic drugs in developing countries, especially in Madagascar.
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Frank T, Arlet G, Gautier V, Talarmin A, Bercion R. Extended-spectrum beta-lactamase-producing Enterobacteriaceae, Central African Republic. Emerg Infect Dis 2006; 12:863-5. [PMID: 16710958 PMCID: PMC3374433 DOI: 10.3201/eid1205.050951] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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Menard D, Yapou F, Manirakiza A, Djalle D, Matsika-Claquin MD, Talarmin A. Polymorphisms in pfcrt, pfmdr1, dhfr genes and in vitro responses to antimalarials in Plasmodium falciparum isolates from Bangui, Central African Republic. Am J Trop Med Hyg 2006; 75:381-7. [PMID: 16968910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
Drug resistance is probably the greatest challenge to most malaria-control programs. Given the limited resources for other malarial-control measures, rational drug used is crucial. Molecular markers for parasite resistance such as pfcrt, pfmdr-1, and dhfr have the potential to be used in an integrated fashion to provide timely information that is useful to policy makers. Therefore, we evaluated polymorphisms in these genes from Plasmodium falciparum and their association with in vitro antimalarial drug resistance to 135 parasites samples collected in Bangui in 2004. For the dhfr gene, we found a strong association between the dhfr genotype and chemosensitivity to pyrimethamine. For the pfcrt gene, we found that haplotypes with mutant-type alleles led to significant changes in the IC50 values for chloroquine, monodesethylamodiaquine, and quinine. We found no correlations for the pfmdr1 gene. These findings suggest that a regular monitoring and screening for resistance markers for antifolates and for chloroquine could act as an adjunct to in vivo trials.
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Kassa-Kelembho E, Kassa E, Zandanga G, Service YB, Ignaleamoko A, Talarmin A. Poor performance of a novel serological test for diagnosis of pulmonary tuberculosis in Bangui, Central African Republic. CLINICAL AND VACCINE IMMUNOLOGY : CVI 2006; 13:702-3. [PMID: 16760330 PMCID: PMC1489549 DOI: 10.1128/cvi.00194-05] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
We assessed the performance of a serological test for tuberculosis (SDHO Laboratories Inc., Canada) in our setting. Among 68 of 99 suspected pulmonary tuberculosis patients who were scored as having tuberculosis on the basis of Mycobacterium tuberculosis-positive culture, the sensitivity of the serological test was lower than that of sputum smear microscopic examination (20.6% versus 80.9%, respectively; P < 0.000001).
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Matsika-Claquin MD, Ménard D, Fontanet AL, Ngwhotue A, Sarda J, Talarmin A. Efficacy of chloroquine–proguanil malaria prophylaxis in a non-immune population in Bangui, Central African Republic: a case–control study. Trans R Soc Trop Med Hyg 2006; 100:381-6. [PMID: 16313935 DOI: 10.1016/j.trstmh.2005.07.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2004] [Revised: 06/28/2005] [Accepted: 07/15/2005] [Indexed: 10/25/2022] Open
Abstract
A case-control study was conducted to evaluate the efficacy of the combination of chloroquine plus proguanil as malaria prophylaxis in a non-immune population living in the Central African Republic. Cases were patients presenting with a malaria attack confirmed by a positive blood film and/or an HRP2 positive antigen test at the Pasteur Institute of Bangui. Two control subjects were included per case: one was a relative or close friend and the other was matched to the patient with respect to the length of stay. A questionnaire assessing malaria prophylaxis habits and malarial risk factors over the 2-month period prior to inclusion in the study was given to 48 cases and 96 controls. A conditional logistic regression was used to identify risk factors. The efficacy of the chloroquine plus proguanil regimen was found to be high (95.5%, 95% CI 74.0-99.2%) in this country known for high chloroquine resistance. Our data lend some support to the use of chloroquine plus proguanil in Bangui, and the protective efficacy of chloroquine plus proguanil should now be studied prospectively as part of a randomised controlled trial of various prophylactic drugs.
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Menard D, Djalle D, Yapou F, Manirakiza A, Talarmin A. Frequency distribution of antimalarial drug-resistant alleles among isolates of Plasmodium falciparum in Bangui, Central African Republic. Am J Trop Med Hyg 2006; 74:205-10. [PMID: 16474071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023] Open
Abstract
We determined the baseline frequency distribution of mutant alleles of genes associated with resistance to chloroquine and sulfadoxine-pyrimethamine in Plasmodium falciparum isolates in Bangui, Central African Republic. Mutant alleles of the P. falciparum chloroquine resistance transporter (pfcrt) gene were found in all samples and the frequency of the deduced CIET pfcrt haplotype was high (45%). The most common allele of the P. falciparum multidrug resistance 1 (pfmdr1) gene among the field isolates of P. falciparum was 86Y (21.9%). The 1246Y allele was also common (18.0%). Of the 167 P. falciparum isolates in which the dihydrofolate reductase gene was studied, only 11 carried the wild-type allele (6.6%) whereas many (50.3%) were quadruple mutants (50R, 51I, 59R, 108N). The frequency of the 436A mutant allele of the dihydropteroate synthase gene was high (74.3%), but the frequencies of the 437G (18.6%) and 540E (5.2%) mutant alleles were low. Molecular analyses of antimalarial drug-resistant alleles of P. falciparum isolates in Bangui strongly suggest the widespread distribution of chloroquine and pyrimethamine resistance and to a lesser extent sulfadoxine resistance.
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Lavergne A, de Thoisy B, Lacoste V, Pascalis H, Pouliquen JF, Mercier V, Tolou H, Dussart P, Morvan J, Talarmin A, Kazanji M. Mayaro virus: complete nucleotide sequence and phylogenetic relationships with other alphaviruses. Virus Res 2005; 117:283-90. [PMID: 16343676 DOI: 10.1016/j.virusres.2005.11.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2005] [Revised: 11/08/2005] [Accepted: 11/08/2005] [Indexed: 11/23/2022]
Abstract
Mayaro (MAY) virus is a member of the genus Alphavirus in the family Togaviridae. Alphaviruses are distributed throughout the world and cause a wide range of diseases in humans and animals. Here, we determined the complete nucleotide sequence of MAY from a viral strain isolated from a French Guianese patient. The deduced MAY genome was 11,429 nucleotides in length, excluding the 5' cap nucleotide and 3' poly(A) tail. Nucleotide and amino acid homologies, as well as phylogenetic analyses of the obtained sequence confirmed that MAY is not a recombinant virus and belongs to the Semliki Forest complex according to the antigenic complex classification. Furthermore, analyses based on the E1 region revealed that MAY is closely related to Una virus, the only other South American virus clustering with the Old World viruses. On the basis of our results and of the alphaviruses diversity and pathogenicity, we suggest that alphaviruses may have an Old World origin.
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Kazanji M, Dussart P, Duprez R, Tortevoye P, Pouliquen JF, Vandekerkhove J, Couppié P, Morvan J, Talarmin A, Gessain A. Serological and molecular evidence that human herpesvirus 8 is endemic among Amerindians in French Guiana. J Infect Dis 2005; 192:1525-9. [PMID: 16206066 DOI: 10.1086/491744] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2005] [Accepted: 05/25/2005] [Indexed: 11/04/2022] Open
Abstract
We evaluated the presence of human herpesvirus 8 (HHV-8) infection among groups of Amerindians in French Guiana. The overall prevalence of antibodies against lytic HHV-8 antigens was 23.0% (180/781), increasing from 18.4% in children <6 years old to approximately 30% in older persons (>45 years). Seroprevalence was higher in Amerindians living in remote localities than it was in those living in the coastal region. Analysis of a 725-base pair fragment of the K1 gene amplified from DNA from a Wayampi Amerindian showed that the virus belonged to molecular subtype E, which has hitherto been found in only a few Amerindians in Brazil and Ecuador.
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Menard D, Matsika-Claquin MD, Djalle D, Yapou F, Manirakiza A, Dolmazon V, Sarda J, Talarmin A. Association of failures of seven-day courses of artesunate in a non-immune population in Bangui, Central African Republic with decreased sensitivity of Plasmodium falciparum. Am J Trop Med Hyg 2005; 73:616-21. [PMID: 16172492] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023] Open
Abstract
We assessed the efficacy and safety of a seven-day course of artesunate for the treatment of uncomplicated Plasmodium falciparum malaria in 55 non-immune patients living in Bangui, Central African Republic. The parasitologic cure rates were 100%, 95%, and 85% on days 14, 28, and 42, respectively. There were no significant differences in parasitemia density, 50% inhibitory concentration of dihydroartemisinin, and frequency of mutant P. falciparum multidrug resistance 1 codon 86 between patients who were cured and those who displayed recrudescence. However, the 90% inhibitory concentration for dihydroartemisinin and the number of genotypes isolated were both higher in the recrudescent patients (five- and two-fold, respectively). We found an association between recrudescence and decreased sensitivity. This suggests that the use of artemisinin compounds alone will select resistant strains. We conclude that artesunate should not be used in monotherapy even in seven-day courses, but only in combination with other anti-malarials to prevent the emergence of resistant P. falciparum.
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