Evaluation of a novel digital environment for learning medical parasitology.

open access articleEukaryotic parasites represent a serious human health threat requiring health professionals with parasitology skills to counteract this threat. However, recent surveys highlight an erosion of teaching of parasitology in medical and veterinary schools, despite reports of increasing instances of food and water borne parasitic infections. To address this we developed a web-based resource, DMU e-Parasitology®, to facilitate the teaching and learning of parasitology, comprising four sections: theoretical; virtual laboratory; virtual microscopy; virtual clinical case studies. Testing the package was performed using a questionnaire given to ninety-five Pharmacy students in 2017/18 to assess effectiveness of the package as a teaching and learning tool. 89.5% of students reported appropriate acquisition of knowledge of the pathology, prevention and treatment of some parasitic diseases. 82.1% also welcomed the clinical specialism of the package as it helped them to acquire basic diagnostic skills, through learning infective features/morphology of the parasites

Pneumocystis jirovecii and microsporidia: An unusual coinfection in HIV patients?

Pneumocystis jirovecii and microsporidia species are recognized as opportunistic infectious pathogens in AIDS patients. Coinfection of both in one patient has been rarely reported. The aim of the present study was to investigate the coinfection of P. jirovecii and microsporidia in different tissues from AIDS deceased patients. Post mortem histological finding of P. jirovecii and microsporidia was demonstrated by means of the Grocott’smethenamine silver and Brown Brenn staining, respectively. Molecular technique was used for identification and characterization of both fungi. Out of the 514 autopsied cases P. jirovecii andmicrosporidia species were identified in 53 (10.3%) and 62 (12.1%) cases respectively. A total of five cases (0.97%) coinfected with Pneumocystis and microsporidia were recovered from all analyzed autopsies. Coinfection of Pneumocystis and microsporidia is very challenging and raises interesting issues about host-parasite relationship. The early diagnosis of both pathogens must be crucial to establish correct and early treatments, improve the patient’s evolution, reducing the risk of death

Identificación de Leishmania infantum en Puerto Iguazú, Misiones, Argentina

The emergence of zoonotic visceral leishmaniasis (ZVL) in Latin America is a growing public health problem. The urbanization of ZVL has been observed in different countries around the world, and there are a growing number of reports drawing attention to the emergence of this infection in new locations, as well as its increase in previously established areas of endemicity. In the city of Posadas, Misiones province, Northeastern Argentina, the transmission of ZVL associated with canines and Lutzomyia longipalpis was first reported in 2006. In the city of Puerto Iguazú, also in Misiones province, the first human case of ZVL was reported in February 2014. From 209 surveyed dogs, 15 (7.17%) were identified as positive by serological and/or parasitological methods. Amplification was observed in 14 samples and in all cases the species implicated was Leishmania infantum. To the authors’ knowledge, this is the first molecular characterization of L. infantum from dogs in this area.La emergencia de leishmaniosis visceral zoonótica (LVZ) en América Latina es problema de salud pública en aumento. La urbanización de la LVZ es un fenómeno observado en diferentes países alrededor del mundo y hay un número creciente tanto de denuncias respecto a la aparición de esta infección en nuevas ubicaciones, como su aumento en zonas endémicas previamente establecidas. En la ciudad de Posadas, provincia de Misiones, nordeste de Argentina, la transmisión de LVZ asociada a canes y Lutzomyia longipalpis fue descrita por primera vez en 2006. En la ciudad de Puerto Iguazú, provincia de Misiones, el primer caso humano de LVZ tuvo lugar en febrero de 2014. De 209 perros muestreados, 15 (7.17%) resultaron positivos mediante métodos serológicos y/o parasitológicos. Se observó amplificación en 14 muestras y en todos los casos la especie implicada fue Leishmania infantum. Según nuestro conocimiento, esta es la primera caracterización molecular de L. infantum en perros procedentes de este área

Syphilis and HIV infection in indigenous Mbya Guarani communities of Puerto Iguazu (Argentina): diagnosis, contact tracking, and follow-up

The aim of study was to assess the prevalence of Treponema pallidum and HIV infection in Amerindian people (Mbya Guarani) over the age of 11 in Puerto Iguazu (Argentina) and to describe the contact tracking of cases. The method was a cross-sectional study in the Mbya Guarani people living in three villages of Puerto Iguazu (community A, pop. 1,146; community B, pop. 369; and community C, pop. 149). Participants were randomly invited to participate in the survey and in blood testing. Of the 551 participants, 48 were infected by T. pallidum (8.71%; 95% confidence interval [CI] 7.38-10.04). The infection prevalence decreased with age, standing at 9.66% in the 11-19 age group, 8.42% in 20-39 age group and 4.54% in people aged 40 and older. We tracked 130 contacts for the 48 T. pallidum cases; 39/40 (97.5%) sexual contacts tested positive for syphilis. Among the 90 children born to infected mothers, 76 aged 18 months or older tested negative, while 8/14 younger children were still at risk for congenital syphilis. There were four cases of HIV infection (0.72%, 95% CI 0.31-1.13). Prevalence of T. pallidum infection and HIV infection are relevant in this indigenous community of Argentina, representing a public health concern

Primera caracterización molecular de Leishmania infantum en pacientes con leishmaniosis visceral de la Provincia de Misiones, Argentina

Introduction: Cutaneous leishmaniasis caused by L. braziliensis has been historically endemic in Argentina and several cases of visceral leishmaniasis following initial cutaneous leishmaniasis have been reported. Visceral leishmaniasis started to appear in Argentina in 2006 in the city of Posadas, Misiones province, affecting both humans and dogs.Objective: To identify the etiologic agent to species level in patients with visceral leishmaniasis diagnosis in Misiones province and describe its clinical and epidemiological characteristics.Materials and methods: A cohort of 24 patients from Misiones province was studied from 2009 to 2016, all with a confirmed diagnosis of visceral leishmaniasis. To identify the Leishmania species involved, patient samples were analyzed by microscopy, serologic studies, DNA detection, and sequencing. Variables such as age, sex, place of residence, clinical signs and symptoms consistent with visceral leishmaniasis were also recorded.Results: 75% (18/24) of the patients studied were males and 25% (6/24) were younger than 4 years. The most frequent symptom was a prolonged fever in 87.5% of the patients (21/24), followed by splenomegaly in 70.8% (17/24). Leishmania infantum was the only parasite species identified in all patients.Conclusion: This finding constitutes the first molecular identification of the Leishmania infantum species in autochthonous patients of Misiones province, Argentina. This study highlights the importance of PCR for species identification in epidemiological studies of visceral leishmaniosis in Argentina.Introducción. La leishmaniosis cutánea por Leishmania braziliensis ha sido tradicionalmente endémica en Argentina y se han sido descritos casos de compromiso visceral después de una leishmaniosis cutánea inicial. La leishmaniosis visceral emergió en Argentina en el año 2006 en la ciudad de Posadas, provincia de Misiones, afectando tanto a humanos como a perros.Objetivo. Identificar el agente etiológico a nivel de especie de los pacientes diagnosticados con leishmaniosis visceral en Misiones y describir sus características clínicoepidemiológicas.Materiales y métodos. Se estudió una serie de 24 pacientes con diagnóstico confirmado de leishmaniosis visceral en la provincia de Misiones en el período 2009 al 2016. Para la identificación de Leishmania spp., los pacientes fueron sometidos a estudios diagnósticos indirectos (serológicos) y directos (microscopía, detección de ADN y secuenciación). También, se estudiaron variables como edad, sexo, lugar de residencia, y signos y síntomas clínicos indicativos de leishmaniosis visceral.Resultados. De los 24 pacientes estudiados, 18 (75 %) eran hombres y 6 (25 %) eran menores de cuatro años. La manifestación clínica más frecuente fue el síndrome febril prolongado en 21 (87,5 %) de los pacientes, seguido de esplenomegalia en 17 (70,8 %). Se identificó la especie Leishmania infantum en todos los pacientes estudiados.Conclusión. Este hallazgo constituye la primera identificación de la especie L. infantum en pacientes autóctonos de la provincia de Misiones. El estudio evidenció la importancia de la PCR para el manejo epidemiológico de la leishmaniosis visceral en Argentina

Primera caracterización molecular de Leishmania infantum en pacientes con leishmaniosis visceral de la Provincia de Misiones, Argentina

Introducción. La leishmaniosis cutánea por Leishmania braziliensis ha sidotradicionalmente endémica en Argentina y se han sido descritos casos de compromiso visceral después de una leishmaniosis cutánea inicial. La leishmaniosis visceral emergió en Argentina en el año 2006 en la ciudad de Posadas, provincia de Misiones, afectando tanto a humanos como a perros. Objetivo. Identificar el agente etiológico a nivel de especie de los pacientes diagnosticados con leishmaniosis visceral en Misiones y describir sus características clínico-epidemiológicas.Materiales y métodos. Se estudió una serie de 24 pacientes con diagnóstico confirmado de leishmaniosis visceral en la provincia de Misiones en el período 2009 al 2016. Para la identificación de Leishmania spp., los pacientes fueron sometidos a estudios diagnósticos indirectos (serológicos) y directos (microscopía, detección de ADN y secuenciación). También, se estudiaron variables como edad, sexo, lugar de residencia, y signos y síntomas clínicos indicativos de leishmaniosis visceral. Resultados. De los 24 pacientes estudiados, 18 (75 %) eran hombres y 6 (25 %) eran menores de cuatro años. La manifestación clínica más frecuente fue el síndrome febril prolongado en 21 (87,5 %) de los pacientes, seguido de esplenomegalia en 17 (70,8 %). Se identificó la especie Leishmania infantum en todos los pacientes estudiados. Conclusión. Este hallazgo constituye la primera identificación de la especie L. infantum en pacientes autóctonos de la provincia de Misiones. El estudio evidenció la importancia de la PCR para el manejo epidemiológico de la leishmaniosis visceral en Argentina

New cryptosporidium genotypes in HIV-infected persons.

Using DNA sequencing and phylogenetic analysis, we identified four distinct Cryptosporidium genotypes in HIV-infected patients: genotype 1 (human), genotype 2 (bovine) Cryptosporidium parvum, a genotype identical to C. felis, and one identical to a Cryptosporidium sp. isolate from a dog. This is the first identification of human infection with the latter two genotypes

A canine leishmaniasis pilot survey in an emerging focus of visceral leishmaniasis: Posadas (Misiones, Argentina)

<p>Abstract</p> <p>Background</p> <p>An increasing number of reports are calling our attention to the worldwide spread of leishmaniasis. The urbanization of zoonotic visceral leishmaniasis (VL) has been observed in different South American countries, due to changes in demographic and ecological factors. In May 2006, VL was detected for the first time in the city of Posadas (Misiones, Argentina). This event encouraged us to conduct a clinical and parasitological pilot survey on domestic dogs from Posadas to identify their potential role as reservoirs for the disease.</p> <p>Methods</p> <p>One hundred and ten dogs from the city of Posadas were included in the study. They were selected based on convenience and availability. All dogs underwent clinical examination. Symptomatology related to canine leishmaniasis was recorded, and peripheral blood and lymph node aspirates were collected. Anti-<it>Leishmania </it>antibodies were detected using rK39-immunocromatographic tests and IFAT. Parasite detection was based on peripheral blood and lymph node aspirate PCR targeting the <it>SSUrRNA </it>gene. Molecular typing was addressed by DNA sequence analysis of the PCR products obtained by <it>SSUrRNA </it>and ITS-1 PCR.</p> <p>Results</p> <p>According to clinical examination, 69.1% (76/110) of the dogs presented symptoms compatible with canine leishmaniasis. Serological analyses were positive for 43.6% (48/110) of the dogs and parasite DNA was detected in 47.3% (52/110). A total of 63 dogs (57.3%) were positive by serology and/or PCR. Molecular typing identified <it>Leishmania infantum </it>(syn. <it>Leishmania chagasi</it>) as the causative agent.</p> <p>Conclusions</p> <p>This work confirms recent findings which revealed the presence of <it>Lutzomyia longipalpis</it>, the vector of <it>L. infantum </it>in this area of South America. This new VL focus could be well established, and further work is needed to ascertain its magnitude and to prevent further human VL cases.</p

Identification and Characterization of Microsporidia from Fecal Samples of HIV-Positive Patients from Lagos, Nigeria

BACKGROUND: Microsporidia are obligate intracellular parasites that infect a broad range of vertebrates and invertebrates. They have been increasingly recognized as human pathogens in AIDS patients, mainly associated with a life-threatening chronic diarrhea and systemic disease. However, to date the global epidemiology of human microsporidiosis is poorly understood, and recent data suggest that the incidence of these pathogens is much higher than previously reported and may represent a neglected etiological agent of more common diseases indeed in immunocompetent individuals. To contribute to the knowledge of microsporidia molecular epidemiology in HIV-positive patients in Nigeria, the authors tested stool samples proceeding from patients with and without diarrhea. METHODOLOGY/PRINCIPAL FINDINGS: Stool samples from 193 HIV-positive patients with and without diarrhea (67 and 126 respectively) from Lagos (Nigeria) were investigated for the presence of microsporidia and Cryptosporidium using Weber's Chromotrope-based stain, Kinyoun stain, IFAT and PCR. The Weber stain showed 45 fecal samples (23.3%) with characteristic microsporidia spores, and a significant association of microsporidia with diarrhea was observed (O.R. = 18.2; CI: 95%). A similar result was obtained using Kinyoun stain, showing 44 (31,8%) positive samples with structures morphologically compatible with Cryptosporidium sp, 14 (31.8%) of them with infection mixed with microsporidia. The characterization of microsporidia species by IFAT and PCR allowed identification of Enterocytozoon bieneusi, Encephalitozoon intestinalis and E. cuniculi in 5, 2 and 1 samples respectively. The partial sequencing of the ITS region of the rRNA genes showed that the three isolates of E.bieneusi studied are included in Group I, one of which bears the genotype B. CONCLUSIONS/SIGNIFICANCE: To our knowledge, this is the first report of microsporidia characterization in fecal samples from HIV-positive patients from Lagos, Nigeria. These results focus attention on the need to include microsporidial diagnosis in the management of HIV/AIDS infection in Nigeria, at the very least when other more common pathogens have not been detected