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- Volume 84, Issue 6, June 2011
The American Journal of Tropical Medicine and Hygiene - Volume 84, Issue 6, June 2011
Volume 84, Issue 6, June 2011
- Images in Clinical Tropical Medicine
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Tuberculosis-Associated Chronic Kidney Disease
Pages: 843–844More LessAbstract.Extrapulmonary tuberculosis (TB) account for approximately 15–20% of TB cases in immunocompetent patients. The genitourinary system is the third most commonly affected site. We report the case of a 20-year-old man admitted with fever, chills, dry cough, right flank pain, and oliguria who developed renal function loss. The pyelogram evidenced silence of the right kidney, and the abdominal and pelvic magnetic resonance showed significant dilation of the right pyelocaliceal system and proximal ureter. Biopsies of renal cortex and retroperitoneal lymph nodes showed caseous granuloma consistent with TB. Treatment was started with rifampicin, isoniazid, pyrazinamide, and ethambutol, and the patient presented a favorable outcome but with non-dialytic chronic kidney disease. This case illustrates a case of chronic kidney disease secondary to TB in a young, otherwise healthy man.
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A Cluster of Cutaneous Leishmaniasis Associated with Human Smuggling
Pages: 847–850More LessAbstract.Cutaneous leishmaniasis (CL) is rarely seen in the United States, and the social and geographic context of the infection can be a key to its diagnosis and management. Four Somali and one Ethiopian, in U.S. Border Patrol custody, came to the United States by the same human trafficking route: Djibouti to Dubai to Moscow to Havana to Quito; and then by ground by Columbia/Panama to the United States - Mexico border where they were detained. Although traveling at different times, all five patients simultaneously presented to our institution with chronic ulcerative skin lesions at different sites and stages of evolution. Culture of biopsy specimens grew Leishmania panamensis. Soon thereafter, three individuals from East Africa traveling the identical route presented with L. panamensis CL to physicians in Tacoma, WA. We document here the association of a human trafficking route and new world CL. Clinicians and public health officials should be aware of this emerging infectious disease risk.
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The Aftermath of the Western Australian Melioidosis Outbreak
Pages: 851–857More LessAbstract.Melioidosis became a notifiable disease in Western Australia (WA) 2 years after the West Kimberley melioidosis outbreak. Two cases of melioidosis caused by the outbreak genotype of Burkholderia pseudomallei (National Collection of Type Cultures [NCTC] 13177) occurred in 1998 and 1999 in persons who visited the outbreak location at the time. No other infections caused by the outbreak strain have been recorded in WA since that time, despite an average of four culture-positive cases per year. Sporadic cases of melioidosis often follow tropical storms and cyclones during summer, and they have been detected outside the endemic area when cyclones travel far inland. In 2007, environmental isolates resembling NCTC 13177 were found 500 km east of the outbreak location after unusually severe weather. Recent whole-genome analysis places NCTC 13177 genetically close to other Australian isolates. Additional biogeographic and ecological studies are needed to establish the relative importance of environmental cofactors in disease pathogenesis.
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Repeat Blood Culture Positive for B. pseudomallei Indicates an Increased Risk of Death from Melioidosis
Pages: 858–861More LessAbstract.Melioidosis, a bacterial infection caused by Burkholderia pseudomallei, is notoriously difficult to cure despite appropriate antimicrobial therapy and has a mortality rate of up to 40%. We demonstrate that a blood culture positive for B. pseudomallei taken at the end of the first and/or second week after hospitalization for melioidosis is a strong prognostic factor for death (adjusted odds ratio = 4.2, 95% confidence interval = 2.1–8.7, P < 0.001 and adjusted odds ratio = 2.6, 95% confidence interval = 1.1–6.0, P = 0.03, respectively). However, repeat cultures of respiratory secretions, urine, throat swabs, or pus/surface swabs provide no prognostic information. This finding highlights the need for follow-up blood cultures in patients with melioidosis.
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Climate Variability and the Outbreaks of Cholera in Zanzibar, East Africa: A Time Series Analysis
Pages: 862–869More LessAbstract.Global cholera incidence is increasing, particularly in sub-Saharan Africa. We examined the impact of climate and ocean environmental variability on cholera outbreaks, and developed a forecasting model for outbreaks in Zanzibar. Routine cholera surveillance reports between 1997 and 2006 were correlated with remotely and locally sensed environmental data. A seasonal autoregressive integrated moving average (SARIMA) model determined the impact of climate and environmental variability on cholera. The SARIMA model shows temporal clustering of cholera. A 1°C increase in temperature at 4 months lag resulted in a 2-fold increase of cholera cases, and an increase of 200 mm of rainfall at 2 months lag resulted in a 1.6-fold increase of cholera cases. Temperature and rainfall interaction yielded a significantly positive association (P < 0.04) with cholera at a 1-month lag. These results may be applied to forecast cholera outbreaks, and guide public health resources in controlling cholera in Zanzibar.
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The Variability of Childhood Diarrhea in Karachi, Pakistan, 2002–2006
Pages: 870–877More LessAbstract.Diarrhea burden is often estimated using cross-sectional surveys. We measured variability in diarrhea prevalence among children < 5 years of age living in squatter settlements in central Karachi, Pakistan. We pooled data from non-intervention control households from studies conducted from 2002 through 2006. The prevalence of diarrhea varied on average by 29% from one week to the next, by 37% from one month to the next, and during peak diarrhea season by 32% from one year to the next. During 24 months when the same nine neighborhoods were under surveillance, each month the prevalence of diarrhea varied by at least an order of magnitude from the lowest to the highest prevalence neighborhood, and each neighborhood recorded the highest diarrhea prevalence during at least one month. Cross-sectional surveys are unreliable measures of diarrhea prevalence.
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AIDS Diarrhea and Antiretroviral Drug Concentrations: A Matched-Pair Cohort Study in Port au Prince, Haiti
Pages: 878–882More LessAbstract.Diarrhea in patients with acquired immunodeficiency syndrome (AIDS) may cause malabsorption of medications and failure of antiretroviral therapy (ART). We prospectively evaluated human immunodeficiency virus-1 (HIV-1)-infected patients with and without chronic diarrhea initiating ART in Haiti. We report mean plasma antiretroviral concentrations at 2 and 4 weeks. We measured plasma HIV-1 RNA levels at four points. Fifty-two HIV-1-infected patients (26 matched pairs) were enrolled. No differences in antiretroviral concentrations were detected. At week 24, 18/25 (72%) cases and 16/24 (68%) controls had undetectable plasma HIV-1 RNA levels (P = 0.69). Patients with plasma HIV-1 RNA levels > 50 copies/mL at week 24 had lower early efavirenz concentrations than patients with undetectable HIV-1 RNA (2,621 ng/mL versus 5,278 ng/mL; P = 0.02). Diarrhea at ART initiation does not influence plasma concentrations of the medications evaluated. Virologic outcome at Week 24 does correlate with efavirenz concentrations early in therapy but not with the presence of chronic diarrhea.
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Blastocystis sp. Subtype 4 is Common in Danish Blastocystis-Positive Patients Presenting with Acute Diarrhea
Pages: 883–885More LessAbstract.Fecal samples from 444 Danish patients presenting with acute diarrhea were tested for Blastocystis and positive samples were subtyped to investigate the prevalence and subtype distribution of Blastocystis in this patient group. A total of 25 patients (5.6%) were positive, and 19 of these patients (76.0%) were positive for Blastocystis sp. ST4. Because the relative prevalence of ST4 in other patients presenting with other types of diarrhea (persistent, travel-related, and human immunodeficiency virus-related) in Denmark is low, the role of Blastocystis sp. ST4 in the etiology of acute diarrhea should be investigated further.
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Enteric Pathogens Associated with Childhood Diarrhea in Tripoli-Libya
Pages: 886–891More LessAbstract.Stool samples from children < 5 years of age with diarrhea (N = 239) were examined for enteric pathogens using a combination of culture, enzyme-immunoassay, and polymerase chain reaction methods. Pathogens were detected in 122 (51%) stool samples; single pathogens were detected in 37.2% and co-pathogens in 13.8% of samples. Norovirus, rotavirus, and diarrheagenic Escherichia coli (DEC) were the most frequently detected pathogens (15.5%, 13.4%, and 11.2%, respectively); Salmonella, adenovirus, and Aeromonas were detected less frequently (7.9%, 7.1%, and 4.2%). The most commonly detected DEC was enteroaggregative E. coli (5.4%). Resistance to ≥ 3 antimicrobials was observed in 60% (18/30) of the bacterial pathogens. Salmonella resistance to ciprofloxacin (63.1%) has become a concern. Enteric viral pathogens were the most significant causative agents of childhood diarrhea in Tripoli. Bacterial pathogens were also important contributors to pediatric diarrhea. The emergence of ciprofloxacin-resistant Salmonella represents a serious health problem that must be addressed by Libyan health authorities
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Pharmacokinetics of Oral Sitamaquine Taken with or without Food and Safety and Efficacy for Treatment of Visceral Leishmaniais: A Randomized Study in Bihar, India
Pages: 892–900More LessAbstract.This randomized, open-label study of patients in India with visceral leishmaniasis (VL) investigated the effect of food on sitamaquine and desethyl-sitamaquine pharmacokinetics. Patients were randomized to receive oral sitamaquine, 2 mg/kg/day, once a day for 21 days across four cohorts (n = 41) (fasted/fed, fed/fasted, fed/fed, and fasted/fasted) over two periods (days 1−10 and 11−21), or intravenous amphotericin B (AmB), 1 mg/kg every other day for 30 days (n = 20). Mean day 21 pharmacokinetics across the four cohorts were sitamaquine, area under curve (AUC)(0−τ) = 6,627−8,903 ng.hr/mL, AUC(0−16) = 4,859−6,633 ng.hr/mL, maximum plasma concentration (C max) = 401−570 ng/mL, apparent terminal half-life (t 1/2) = 18.3−22.8 hr, time to reach C max (t max) = 3.5−6 hr; and desethyl-sitamaquine, AUC(0−τ) = 2,307−3,163 ng.hr/mL, C max = 109−154 ng/mL, t 1/2 = 23.0−27.9 hr, t max = 2−10 hr, with no significant food effect. On-therapy adverse events were observed for sitamaquine in 4 (10%) of 41 patients and for AmB in 17 (85%) of 20 patients. The final clinical cure (day 180) was 85% (95% confidence interval = 70.8–94.4%) for sitamaquine and 95% (95% confidence interval = 75.1–99.9) for AmB. Sitamaquine can be taken regardless of food intake, was generally well tolerated, and showed potential efficacy in patients with visceral leishmaniasis.
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Endemic Tegumentary Leishmaniasis in Brazil: Correlation between Level of Endemicity and Number of Cases of Mucosal Disease
Pages: 901–905More LessAbstract.The purpose of this study was to establish a correlation between the endemic level of tegumentary leishmaniasis in different regions of Brazil during 2002–2009 and the number of cases of mucosal or mucocutaneous leishmaniasis. The proportion of mucosal leishmaniasis was inversely correlated with prevalence of infection. In areas with a lower infection prevalence, the proportion of mucosal leishmaniasis increased (P < 0.05). The hypothesis of an Amazonian origin and dissemination through human migration is considered. Our results show that in regions with lower prevalence and endemically younger, the proportion of cases that evolve to the mucosal form is higher than in regions with higher prevalence and endemically older.
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Disseminated Cutaneous Leishmaniasis Resembling Post-Kala-Azar Dermal Leishmaniasis Caused by Leishmania donovani in Three Patients Co-Infected with Visceral Leishmaniasis and Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome in Ethiopia
Pages: 906–912More LessAbstract.We report paired strains of Leishmania parasites, one from the viscera and the other from skin lesions that were isolated from three patients with visceral leishmaniasis and disseminated cutaneous leishmaniasis that were co-infected with human immunodeficiency virus. The causative parasites were characterized by polymerase chain reaction–restriction length polymorphism of the ribosomal DNA internal transcribed spacer 1 and by a panel of multilocus microsatellite markers. We demonstrated that the causative agent was Leishmania donovani in all cases, irrespective of the phenotype of the disease. The paired strains from viscera and skin lesions of the same patients showed genetic identity across the 14 microsatellite markers investigated. These findings demonstrate that the skin lesions in these human immunodeficiency virus–positive patients with visceral leishmaniasis were caused by dissemination of viscerotropic L. donovani parasites as a consequence of severe immunosuppression. However, in all three patients, rapid clearance of the skin lesions was observed after antimonial therapy.
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Phylogenetics of the Phlebotomine Sand Fly Group Verrucarum (Diptera: Psychodidae: Lutzomyia)
Pages: 913–922More LessAbstract.Within the sand fly genus Lutzomyia, the Verrucarum species group contains several of the principal vectors of American cutaneous leishmaniasis and human bartonellosis in the Andean region of South America. The group encompasses 40 species for which the taxonomic status, phylogenetic relationships, and role of each species in disease transmission remain unresolved. Mitochondrial cytochrome c oxidase I (COI) phylogenetic analysis of a 667-bp fragment supported the morphological classification of the Verrucarum group into series. Genetic sequences from seven species were grouped in well-supported monophyletic lineages. Four species, however, clustered in two paraphyletic lineages that indicate conspecificity—the Lutzomyia longiflocosa–Lutzomyia sauroida pair and the Lutzomyia quasitownsendi–Lutzomyia torvida pair. COI sequences were also evaluated as a taxonomic tool based on interspecific genetic variability within the Verrucarum group and the intraspecific variability of one of its members, Lutzomyia verrucarum, across its known distribution.
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Decreased Susceptibility to Commonly Used Antimicrobial Agents in Bacterial Pathogens Isolated from Urinary Tract Infections in Rwanda: Need for New Antimicrobial Guidelines
Pages: 923–928More LessAbstract.The aim of this study was to obtain data on susceptibility patterns of pathogens responsible for both community and hospital urinary tract infections (UTIs); and analyzed risk factors for infection caused by ciprofloxacin-resistant Escherichia coli and extended-spectrum β-lactamace (ESBL)-producing strains in Rwanda. Of 1,012 urine cultures prospectively studied, a total of 196 (19.3%) yielded significant growth of a single organism. The most common isolate (60.7%) was Escherichia coli. The antibiotics commonly used in UTIs are less effective except Fosfomycin-trometamol and imipinem. The use of ciprofloxacin in the previous 6 months (odds ratio [OR] = 7.59 [1.75–32.74]), use of other antibiotics in the previous 6 months (OR = 1.02 [1.02–2.34]), and production of ESBL (OR = 19.32 [2.62–142.16]) were found to be associated with ciprofloxacin resistance among the E. coli isolates. Risk factors for ESBL positivity were the use of ciprofloxacin and third-generation cephalosporin in the preceding 6 months (OR = 3.05 [1.42–6.58] and OR = 9.78 [2.71–35.25], respectively); and being an inpatient (OR = 2.27 [1.79–2.89]). Fosfomycin-trometamol could be included as a reasonable alternative for the therapy of uncomplicated UTI in Rwanda.
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Diagnosis of Gestational, Congenital, and Placental Malaria in Colombia: Comparison of the Efficacy of Microscopy, Nested Polymerase Chain Reaction, and Histopathology
Pages: 929–935More LessAbstract.The technical capability of different methods to diagnose Plasmodium in maternal peripheral blood, placenta, and umbilical cord blood has not been assessed in Colombia and seldom explored in other malaria-endemic regions. We designed a study to compare the technical and the operational-economical performances of light microscopy (LM), nested polymerase chain reaction (nPCR), and histopathology (HP). In maternal blood, LM had 41% sensitivity and 100% specificity and in placental blood, 35% and 100%, respectively, compared with nPCR. In placental tissue, LM had 33% sensitivity and 95% specificity; and nPCR 47% and 77%, respectively; compared with HP. Light microscopy had the best operational-economical qualification. We concluded that nPCR and HP performed better compared with LM, but field implementation of these two techniques remains a problem. Therefore, LM is recommended as the gold standard for diagnosis of gestational malaria and placental blood infection in the field.
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Therapeutic Efficacies of Artemisinin-Based Combination Therapies in Nigerian Children with Uncomplicated Falciparum Malaria during Five Years of Adoption as First-Line Treatments
Pages: 936–943More LessAbstract.The therapeutic efficacies of 3-day regimens of artesunate-amodiaquine and artemether-lumefantrine during 5 years of adoption as first-line treatments were evaluated in 811 ≤ 12-year-old malarious children. Compared with artemether-lumefantrine, amodiaquine-artesunate significantly reduced the proportion of children with fever and parasitemia 1 day after treatment (day 1; P < 0.008 for both). The proportion of parasitemic children on day 2 and gametocytemia on presentation and carriage reduced significantly over the years (P < 0.000001 and P < 0.03, respectively; test for trend). Overall efficacy was 96.5% (95% confidence interval [CI] = 94.5–98.6) and remained unchanged over the years (P = 0.87; test for trend). Kinetics of parasitemias after treatments were estimated by a non-compartmental model. Declines of parasitemias were monoexponential, with a mean elimination half-life of 1.09 hours (95% CI = 1.0–1.16). Parasitemia half-lives and efficacy were similar for both regimens and in all ages. Artesunate-amodiaquine and artemether-lumefantrine remain efficacious treatments of uncomplicated falciparum malaria in Nigerian children 5 years after adoption.
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Antibody Responses and Avidity of Naturally Acquired Anti-Plasmodium vivax Duffy Binding Protein (PvDBP) Antibodies in Individuals from an Area with Unstable Malaria Transmission
Pages: 944–950More LessAbstract.Plasmodium vivax remains an important cause of morbidity outside Africa, and no effective vaccine is available against this parasite. The P. vivax Duffy binding protein (PvDBP) is essential during merozoite invasion into erythrocytes, and it is a target for protective immunity against malaria. This investigation was designed to evaluate naturally acquired antibodies to two variant forms of PvDBP-II antigen (DBP-I and -VI) in malaria individuals (N = 85; median = 22 years) who were living in hypoendemic areas in Iran. The two PvDBP-II variants were expressed in Escherichia coli, and immunoglobulin G (IgG) isotype composition and avidity of naturally acquired antibodies to these antigens were measured using enzyme-linked immunosorbent assay (ELISA). Results showed that almost 32% of the studied individuals had positive antibody responses to the two PvDBP-II variants, and the prevalence of responders did not differ significantly (P > 0.05; χ2 test). The IgG-positive samples exhibited 37.03% and 40.8% high-avidity antibodies for PvDBP-I and PvDBP-VI variants, respectively. Furthermore, high-avidity IgG1 antibody was found in 39.1% of positive sera for each examined variant antigen. The avidity of antibodies for both PvDBP variant antigens and the prevalence of responders with high- and intermediate-avidity IgG, IgG1, and IgG3 antibodies were similar in patients (P > 0.05; χ2 test). Moreover, the prevalence of IgG antibody responses to the two variants significantly increased with exposure and host age. To sum up, the results provided additional data in our understanding of blood-stage immunity to PvDBP, supporting the rational development of an effective blood-stage vaccine based on this antigen.
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Net Risk: A Risk Assessment of Long-Lasting Insecticide Bed Nets Used for Malaria Management
Pages: 951–956More LessAbstract.Despite the demonstrated ability of bed nets that have been factory-impregnated with long-lasting insecticides (LLINs) to protect people from malaria and despite the ambitious plans for their widespread use, the health risks from the LLINs themselves have not been adequately investigated and reported in the peer-reviewed science literature. Here, we use a probabilistic risk assessment approach to estimate the risks to Africans from inhalation, dermal, and oral exposures to the newer LLINs with permethrin, α-cypermethrin, or deltamethrin as the insecticide active ingredient. We estimated exposures to LLINs using 17 age groups to incorporate different body weights and sleeping behaviors. Risk quotients (exposure divided by toxic threshold) at the 50th and 90th percentiles for non-cancer risks were < 1.0 for lifetime adjusted risk and all youth and adult age groups. Risk quotients for infants and toddlers (0–3 years) and child groups from 3 to 10 years were ≥ 1.0 for specific bed nets.
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Dexamethasone Effects in the Strongyloides venezuelensis Infection in A Murine Model
Pages: 957–966More LessAbstract.The aim of this study was to investigate the immunomodulatory effects of glucocorticoids on the immune response to Strongyloides venezuelensis in mice. Balb/c mice were infected with S. venezuelensis and treated with Dexamethasone (Dexa) or vehicle. Dexa treatment increased circulating blood neutrophil numbers and inhibited eosinophil and mononuclear cell accumulation in the blood, bronchoalveolar, and peritoneal fluid compared with control animals. Moreover, Dexa decreased tumor necrosis factor-α (TNF-α), interferon-γ (IFN-γ), interleukin-3 (IL-3), IL-4, IL-5, IL-10, and IL-12 production in the lungs and circulating immunoglobulin G1 (IgG1), IgG2a, and IgE antibody levels while increasing the overall parasite burden in the feces and intestine. Dexa treatment enhanced the fertility of female nematodes relative to untreated and infected mice. In summary, the alterations in the immune response induced by Dexa resulted in a blunted, aberrant immune response associated with increased parasite burden. This phenomenon is similar to that observed in S. stercoralis-infected humans who are taking immunosuppressive or antiinflammatory drugs, including corticosteroids.
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Volumes & issues
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Volume 104 (2021)
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Volume 103 (2020)
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Volume 102 (2020)
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Volume 101 (2019)
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Volume 100 (2019)
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Volume 99 (2018)
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Volume 98 (2018)
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Volume 97 (2017)
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Volume 96 (2017)
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Volume 95 ([2016, 2017])
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