Intestinal parasitic infections and risk factors among the population in Cambodia

@#Many species of helminths and protozoa caused intestinal parasitic infections (IPIs). It belongs to neglected tropical diseases (NTDs) and remains a major public health problem in several Southeast Asian countries. The present study aimed to investigate the prevalence of IPIs and associated risk factors among the population in Kratie Province in northeastern Cambodia and Phnom Penh is the capital that locates in southern Cambodia. Fecal specimens (n=366) were collected in 10 villages in Kratie Province and Phnom Penh from 2019 to 2021. They were processed using the formalin ethyl-acetate concentration technique (FECT) to investigate parasites at egg and cyst stages and then examined under a light microscope. The results revealed that the prevalence of IPIs among the population in Kratie Province (n=317) and Phnom Penh (n=49) was 16.12% (n=59); of Kratie Province (n=50, 13.66%) and Phnom Penh (n=9, 2.46%), 12.02% (n=44) were helminths and 4.10% (n=15) were protozoa. The parasitic infection rate was higher in males (9.02%) than in females (7.10%) and more likely to be due to helminths (7.38%) than protozoa (1.64%). Prevalence of Opisthorchis viverrini was the highest (5.74%), followed by those of Entamoeba coli (4.10%), hookworm (3.83%), Ascaris lumbricoides (1.10%), Hymenolepis nana (1.09%), Taenia spp. (0.54%), Trichuris trichiura (0.55%), and Enterobius vermicularis (0.27%), respectively. Moreover, O. viverrini infection was the most common infection in the >20-year age group in Kratie Province. In addition, the bivariate and multivariate analyses showed that the association between gender. Gender was a significant risk factor positively associated with O. viverrini and hookworm infections (ORadj=0.318, 95% CI=0.122-0.8270, P=0.019 and ORadj=0.085, 95% CI=0.017-0.436, P=0.003, respectively). In conclusion, the IPIs were highly prevalent, especially O. viverrini and hookworm infections, among the population in Cambodia. These IPIs impact the public health burden but can be prevented by education regarding good sanitary practices in this community.

Prevalence of Intestinal Parasites in HIV Seropositive Patients Attending an Integrated Counselling and Testing Centre

HIV infection is the most disastrous and invariably fatal disease. Its devastating effect is due to its relentless and eventually complete destruction of the immune system. As a result, people infected with HIV die not due to the virus itself, but rather due to plethora of opportunistic infections that characterize AIDS. Intestinal parasitic infections are a significant cause of morbidity and mortality in patients infected with HIV in which Diarrhoea is one of the most common clinical presentations.1 With this background, a prospective study was carried out to determine the prevalence of intestinal parasites in HIV seropositive patients attending an Integrated Counselling Testing Centre (ICTC) of a tertiary care hospital.METHODSA cross-sectional study was conducted in a tertiary care multispecialty teaching hospital for a period of one year. Stool specimens of 250 HIV seropositive patients above 18 years of age and belonging to all genders, were screened for intestinal parasites in the present study. The stool specimens submitted were processed using direct wet mounts, concentration technique of formol ether, sedimentation and saturated common salt solution, and permanent staining techniques using Modified Acid-Fast staining, Trichrome staining and Modified Trichrome staining methods.RESULTSThe prevalence of intestinal parasites in HIV seropositive patients was found to be 27.6% (69/250). Protozoan parasites were predominant and were detected in 81.15% (56/69), followed by intestinal helminths in 11.59% (8/69) and coccidian parasites in 7.24% (5/69).CONCLUSIONSIntestinal parasites are a common source of infection in HIV seropositive patients. These patients are a threat not only to themselves but also to others in the community as well. Hence routine screening of all HIV seropositive patients is a must in order to prevent and reduce morbidity and mortality in the community.

Environmental Sanitation Factors and human Behaviour Associated with Intestinal Parasitic Infections in Rural Communities of Cameroon

Introduction: Intestinal parasitic infections stillconstitute major public health threats in many areas in Cameroon. To improve control measures, epidemiological data from environmental and human aspects are necessary to draw concrete control strategies to better follow-up the population at risk.Aim of the Study:This study aimed to investigate environmental risk factors related to infections in the Lolodorf health district, a high risk area ofsouth Cameroon. Methods:A total of 325participants who gave their informed consent were recruited for the study. Stool samples were collected and examined microscopicallyin search ofhelminth eggs and Original ResearchArticleprotozoan cysts using the Kato Katz and concentration Formol-ether techniques. Questionnaires were filled by participants to evaluate the risk factors.Results:Overall, 117 (42.9%) among the 325 participants harbored at least one parasite species with 75 (27.5%) having single infections and 42 (15.4%) having multiple infections. Ascaris lumbricoides(11.0%), Trichuris trichiura(26.4%), Hookworms (12.5%),Entamoeba coli(10.6%) and Entamoeba histolytica/Entamoeba dispar(1,5%) were diagnosed. Females were more infected (48.7%;p=0.04) compared to males (35.2%). Infection rate varied significantly according to villages (p=0.001). Univariate analysis revealed the following: gender (48.7%;p= 0.04), agricultural activities (47.7%; p= 0.04) and absence of treatment (50.8%: p=0.02) to be risk factors correlated to infection. Other factors such as age (49.3%), family size (47.8%), absence of toilets (53.5%), irregular use of shoes (48.6%), not wearing shoes (60.0%), irregular hand washing before meals (48.4%) and eating raw food (45.5%) had high infestation rates though with no significance.Multivariate logistic regression analysis showed that people who had never received any treatment had high risks of being infected (p=0.01; OR =0.17; 95% CI= 0.06 to 0.5).Conclusion:Improved sanitation, water supply and regular and extended deworming in the entire communities are fundamental issues in controlling intestinal parasitic infections

Prevalencia de parasitismo intestinal y sus factores asociados en publicaciones indexadas de colombia: revisión sistemática 2000-2017

Introducción. En Colombia, las parasitosis intestinales constituyen un problema de salud pública poco investigado (o invisibilizado), a pesar de su relevancia como trazador de pobreza. Objetivo. Analizar la prevalencia de parasitismo intestinal y sus factores asociados en publicaciones indexadas de Colombia 1990-2017. Métodos. Revisión sistemática de la literatura científica a partir de la aplicación de un protocolo ex ante de selección de artículos con 40 estrategias, según las fases de identificación, tamización, elección e inclusión de Prisma. Se garantizó la reproducibilidad de la selección de los artículos y la extracción de la información. Se evaluó la calidad metodológica con la guía Strobe. Se estimaron prevalencias generales y específicas según agentes parasitarios, etnia y edad. Resultados. Se incluyeron 20 estudios con 4.226 sujetos, principalmente de Antioquia, niños y población mestiza. La prevalencia general fue 65,9% (IC de 95% = 64,5 - 67,4), con un 38,2% (IC de 95% = 36,3 - 40,0) de poliparasitismo y 19,1% (IC de 95% = 16,2 - 21,9) por especies patógenas. Las infecciones más prevalentes corresponden a Blastocystis hominis con 34,0% (IC de 95 % = 32,5 - 35,6), E. coli 27,4% (IC de 95% = 25,8 - 29,0), E. nana 26,2% (IC de 95% = 24,6 - 27,7) y E. histolytica/dispar/moshkovski 15,1% (IC de 95% = 13,9 - 16,3); mientras que las especies de menor magnitud fueron E. hominis, C. cayatenensis, E. vermicularis y T. hominis. La infección fue 23,6% mayor en niños indígenas en comparación con niños mestizos; en adultos no se registraron diferencias estadísticas según la etnia. Conclusión. Las investigaciones publicadas en revistas indexadas refieren una elevada prevalencia de parasitismo intestinal global, así como la alta frecuencia de algunas especies. Para el caso colombiano, las publicaciones refieren a múltiples factores asociados con la pobreza, las condiciones materiales de vida y los aspectos sociodemográficos; aunque solo se pudo metaanalizar el mayor riesgo de la población de niños e indígenas.

Introduction: In Colombia, intestinal parasitic infections are a public health problem which has little research, even with its relevance as a poverty tracer. Objective: To analyze the prevalence of intestinal parasitism and associated factors in indexed papers in Colombia 1990-2017. Method: Systematic revision of scientific literature through carrying out an ex ante protocol to select articles with 40 strategies, according to identification phases, screening, election and inclusion of prism. Reproducibility of article selection and information extraction was guaranteed. Methodological quality was evaluated with the Strobe guide. General and specific prevalences were estimated according to parasitic agents, ethnicity and age. Results: 20 studies with 4.226 subjects were included, mainly in Antioquia, in Mestizo children. The general preva- lence was 65.9% (CI of 95% = 64.5 - 67.4), with a 38.2% (CI of 95% = 36.340.0) of polyparasitism and 19.1% (CI of 95%=16-2 -21.9) for pathogenic species. Most prevalent infections are Blastocystis hominis with a 34.0% (CI of 95% = 32.5 - 35.6), E. coli 27.4% (CI of 95% = 25.8 - 29.0), E. nana 26.2% (CI of 95% = 24.6 - 27.7) and E. histolytica/dispar/moshkovski 15.1 % (IC of 95% = 13.9 - 16.3); while less species where E. hominis, C. cayatenensis, E. vermicularis y T. hominis. The infection was 23.6% higher in indigenous children, compared to Mestizo children. Adults did not register any statistical difference in terms of ethnicity. Conclusion: Research published in indexed journals show an elevated prevalence of global intestinal parasitism, as well as the high frequency of certain species. In the case of Colombia, papers refer to multiple factors associated to poverty, material life conditions and sociodemographic aspects. It was only possible to metaanalyze the risk of children and indigenous children.

Introdução: na Colômbia, as parasitoses intestinais constituem um problema de saúde pública pouco pesquisado ou invisibilizado, embora sua relêvancia como definidor de pobreza. Objetivo: analisar a prevalência de parasitose intestinal e seus fatores associados em publicações indexadas da Colômbia 1990-2017. Métodos: revisão sistemática da literatura científica a partir da aplicado de um protocolo ex ante de seleção de artigos com 40 estratégias, segundo as fases de identificação, rastreio, escolha e inclusão de Prisma. Foi garantida a reprodutibilidade da seleção dos artigos e a extração da informado. Foi evidenciada a qualidade metodológica com o guia Strobe. Foram estimadas prevalencias gerais e específicas segundo agentes parasitários, etnia e idade. Resultados: foram incluídos 20 estudos com 4.226 sujeitos, principalmente de Antioquia, Colômbia, crianzas e população mestiza. A prevalência geral foi 65,9% (IC de 95% = 64,5 - 67,4), com 38,2% (IC de 95% = 36,3 - 40,0) de poliparasitose e 19,1% (IC de 95% = 16,2 - 21,9) por espécies patógenas. As infecções mais prevalentes correspondem a Blastocystis hominis com 34,0% (IC de 95% = 32,5 - 35,6), E. coli 27,4% (IC de 95% = 25,8 - 29,0), E. nana 26,2% (IC de 95% = 24,6 - 27,7) e E. histolytica/dispar/moshkovski 15,1% (IC de 95% = 13,9 - 16,3); enquanto as espécies de menor magnitude foram E. hominis, C. cayatenensis, E. vermicularis e T. hominis. A infecção foi 23,6% maior em crianzas indígenas em comparação com crianças mestizas; em adultos, nao foram registradas diferenças estatísticas segundo a etnia. Conclusão: as pesquisas publicadas em revistas indexadas referem elevada prevalência de parasitose intestinal global, bem como alta frequência de algumas espécies. Para o caso colombiano, as publicações apresentam múltiplos fatores associados com a pobreza, com as condições materiais de vida e com os aspectos sociodemográficos, embora somente tenha sido materializado o maior risco da população de criançãs e indígenas.

Status of intestinal parasitic infections among rural and urban populations, southwestern Iran

Objective: To evaluate the prevalence and risk factors of intestinal parasitic infections in the urban and rural areas of Shushtar County, southwest Iran. Methods: A total of 1 008 fecal samples were analyzed by direct smear examination, formalin-ether concentration, and Ziehl-Neelsen and trichrome staining; furthermore, PCR was used to distinguish Trichostrongylus and hookworm species based on 28S rRNA gene. Results: Totally, 16.0% cases tested positive, either with a pathogenic or a non-pathogenic parasite. Protozoa were detected in 14.0%, helminths in 1.0%, protozoa and helminth co-infections were detected in 0.3%, and co-infections of two protozoa were detected in 0.7% of cases. The most common protozoa and helminths were Giardia duodenalis (7.7%) and Trichostrongylus spp. (0.5%), respectively. Among five microscopy Trichostrongylus positive cases, Trichostrongylus culbriformis was successfully identified in three isolates by sequencing. In the rural areas, the prevalence of parasitic infection was higher (9.8%) than that in the urban areas (6.2%). A significant association was found between educational level, type of drinking water, animals contact, hand-washing, and clinical symptoms. Conclusions: This study indicates that intestinal parasitic infections remain as a public health priority in Shushtar County. It seems that drinking water and environmental sanitation are the main risk factors of parasitic infections in rural areas.

Effects of water, sanitation and hygiene (WASH) education on childhood intestinal parasitic infections in rural Dembiya, northwest Ethiopia: an uncontrolled before-and-after intervention study

BACKGROUND@#Soil-transmitted helminthes (STH) infections are among the most common infections worldwide and affect the most deprived communities. Adequate water, sanitation, and hygiene (WASH) prevents environmental contamination, thereby preventing transmission of STH. Cognizant of this, WASH education was implemented in rural Dembiya to reduce intestinal parasitic infections. This study was, therefore, conducted to assess the impacts of the intervention on households' WASH conditions and prevalence of intestinal parasitic infections.@*METHOD@#An uncontrolled before-and-after intervention study was used. Cross-sectional studies were done before and after the intervention. Two hundred twenty-five and 302 under five children were recruited randomly at the baseline and endline, respectively. Data were collected using a structured questionnaire and observational checklists. Direct stool examination and Kato-Katz methods were used to identify parasites in the stool. We used percent point change and prevalence ratio (PR) to see the effects of the intervention on WASH conditions and prevalence of intestinal parasitic infections respectively. Pearson chi-squared and Fisher's exact tests were used to test for statistically significant percentage point changes of WASH conditions. The effect of the intervention on intestinal parasitic infections was statistically tested on the basis of PR with 95% confidence interval (CI).@*RESULTS@#The baseline prevalence of intestinal parasitic infections was 25.8%, and the endline prevalence was 23.8%. The prevalence of intestinal parasitic infections was not significantly decreased at the endline compared with the baseline [PR = 0.92, 95% CI = (0.62, 1.38)]. Ascaris Lumbricoides was the most prevalent parasitic infection both at the baseline and endline. The proportion of children who had good hygienic condition increased from 1.3% at the baseline to 34.4% at the end line (p <  0.05). The percentage of mothers/care givers who washed hands at different pick times was significantly increased from 24.4% at the baseline to 68.2% at the endline (p <  0.001). The proportion of households who practiced home-based water treatment was significantly increased from 7.6% at the baseline to 47% at the endline (p <  0.001). The proportion of households who used sanitary latrine was increased from 32% at the baseline to 49% at the endline (p <  0.05).@*CONCLUSION@#This before-and-after intervention study found that households' WASH performance was significantly improved at the endline compared with the baseline. The endline prevalence of intestinal parasitic infections was slightly lower than the baseline prevalence; however, the reduction was not statistically significant. The local health office needs to strengthen the WASH education program, mobilize the community to construct WASH facilities, and support the community to sustain households' WASH performance.

Status of intestinal parasitic infections among rural and urban populations, southwestern Iran

Objective: To evaluate the prevalence and risk factors of intestinal parasitic infections in the urban and rural areas of Shushtar County, southwest Iran. Methods: A total of 1 008 fecal samples were analyzed by direct smear examination, formalin-ether concentration, and Ziehl-Neelsen and trichrome staining; furthermore, PCR was used to distinguish Trichostrongylus and hookworm species based on 28S rRNA gene. Results: Totally, 16.0% cases tested positive, either with a pathogenic or a non-pathogenic parasite. Protozoa were detected in 14.0%, helminths in 1.0%, protozoa and helminth co-infections were detected in 0.3%, and co-infections of two protozoa were detected in 0.7% of cases. The most common protozoa and helminths were Giardia duodenalis (7.7%) and Trichostrongylus spp. (0.5%), respectively. Among five microscopy Trichostrongylus positive cases, Trichostrongylus culbriformis was successfully identified in three isolates by sequencing. In the rural areas, the prevalence of parasitic infection was higher (9.8%) than that in the urban areas (6.2%). A significant association was found between educational level, type of drinking water, animals contact, hand-washing, and clinical symptoms. Conclusions: This study indicates that intestinal parasitic infections remain as a public health priority in Shushtar County. It seems that drinking water and environmental sanitation are the main risk factors of parasitic infections in rural areas.

Childhood intestinal parasitic infection and sanitation predictors in rural Dembiya, northwest Ethiopia

BACKGROUND@#Intestinal parasites are a common problem in the world. The greater proportion of infections is associated with poor water, sanitation, and hygiene (WASH). This study was conducted to assess intestinal parasites, WASH condition, and their association in rural Dembiya, northwest Ethiopia.@*METHODS@#A cross-sectional study was employed. Two hundred twenty-five children aged 6-59 months were included. Mothers were interviewed using a structured questionnaire, and the living environment was observed using checklists. Kato-Katz technique was used to determine the intensity of parasitic infections. Escherichia coli (E. coli) was used as a biological indicator for drinking water quality. Multivariable binary logistic regression analysis was conducted to identify WASH predictors of parasites on the basis of adjusted odds ratio (AOR) with 95% confidence interval (CI) and p < 0.05.@*RESULTS@#The prevalence of intestinal parasites was 25.8% (95% CI = 20.3-32.0%). Ascaris lumbricoides (78%), hookworm (12%), Hymenolepis nana (7%), Enterobius vermicularis (5%), Schistosoma mansoni (3%), Giardia lamblia (3%), and Trichuris trichiuria (2%) were identified infections. Intestinal parasites were associated with poor child hand washing practice [AOR = 3.86, 95% CI = 1.53, 9.75], unprotected water sources [AOR = 7.79, 95% CI = 3.30, 18.40], access to water below 20 l/c/d [AOR = 3.05, 95% CI = 1.28, 7.23], poor food safety[AOR = 4.33, 95% CI = 1.62, 11.58], and poor sanitation [AOR = 5.01, 95% CI = 1.56, 16.16].@*CONCLUSION@#A. lumbricoides, hookworm, H. nana, E. vermicularis, S. mansoni, G. lamblia, and T. trichiuria were identified. Child hand washing practice, service level of water supply, water sources, food safety, and sanitation were associated with intestinal parasites. WASH promotion is needed to prevent infections.

An intestinal parasitological survey among the Jehai Orang Aslis (aborigines) of the Temenggor forest, Perak state, Malaysia

Background: In Malaysia, the most common soiltransmitted helminth infections are A. lumbricoides, T. trichiura and hookworms. However, as there have been no extensive surveys on these infections, it is difficult to estimate with certainty the current overall incidence of infection with soil-transmitted helminths (STHs) among the Malaysian population including the Orang Aslis. Materials and Methods: A study was conducted to determine the infection rate of soil-transmitted helminths and intestinal protozoa among the Jehai Orang Aslis (Aborigines). The study was conducted between December 2005 and August 2006, in four Jehai villages of Perak State, Malaysia. A total of 175 stool samples was collected and personal identification such as name, age, household identification, and date of collection were recorded on the spot during collection. Faecal smears were stained with Trichrome for protozoa cysts and trophozoites and the modified Ziehl-Neelsen acid-fast method for the oocyst of Cryptosporidium and Isospora. Wet mounts with tincture of iodine of both stool samples (10% formalin and PVA) were also examined to detect cysts, ova and larva of intestinal helminths. Results: The prevalence rates of Trichuris trichiura, Ascaris lumbricoides and hookworm among the Jehai were 70.8%, 24.0%, and 10.9% respectively. The prevalence of Entamoeba coli, Entamoeba histolytica, Giardia intestinalis, Blastocystis hominis, and microsporidium was 40.6%, 33.7%, 25.7%, 91.4%, and 27.4% respectively. The difference in prevalence rates among the different age-groups and sex were found not significant. Children aged 0-9 years old had the highest prevalence rate of intestinal parasites and only 2 (1.1%) were free of any intestinal parasites. Conclusion: Intestinal parasitic infections were therefore still common among these people. Children aged 0-9 years old were found to have the highest infection rate of all the intestinal parasites examined. Further investigations are needed to determine more specific transmission of these infections, so that an attempt to control these infections can be made.

Prevalence of intestinal parasitic infections in HIV-infected individuals and their relationship with immune status.

Background and Objectives: Intestinal parasitic infection is a common entity in patients infected with human immunodeficiency virus (HIV). These infections may lead to fatal complications in the immuno suppressed individuals. The aim of the present study was to determine the prevalence of intestinal parasitic infections in HIV sero-positive patients and their relationship with the immune status of individuals. Materials and Method s: Fecal samples from 100 HIV sero-positive and an equal number of HIV sero-negative individuals were collected and examined for enteric parasites by direct microscopy. CD4 counts were carried out in only HIV sero-positive patients. Prevalence of intestinal parasites in patients with CD4 count <200 cells/μl, 200-499 cells/μl, and ≥500 cells/μl in HIV-infected patients were compared. Results: Enteric parasites were detected in 59.3% HIV-infected patients with CD4 count <200 cells/μl as compared with 23.5% in patients with CD4 count >200 cells/μl (P < 0.01). Prevalence of coccidian parasites was significantly (P < 0.01) higher (14%) in HIV sero-positive subjects compared with HIV sero-negative subjects (2%). Isospora belli (25%) was the most common parasite with CD4 count <200 cells/μl, followed by Cryptosporidium parvum (12.5%). Prevalence of intestinal parasitic infections was significantly higher in patients with diarrhea, 73.6% than without diarrhea, 25.9%, (P < 0.05). The mean CD4 count of HIV sero-positive patients presenting with diarrhea was significantly (P < 0.01) lower (181.26 ± 135.14) than without diarrhea (352.02 ± 204.03). Conclusion: This study emphasizes the need for routine screening of parasites especially in patients with lower CD4 count so as to decrease the morbidity by ensuring the early treatment of the cases.

Hallazgos epidemiológicos en infecciones parasitarias intestinales de un grupo de niños ingresados por diarreas / Epidemiological findings in intestinal parasitic infections from a group of hospitalized children with diarrhea

Introducción: la enfermedad diarreica es aún una causa importante de mortalidad en países en desarrollo, en los que afecta principalmente a los niños menores de 5 años de edad. En Cuba, aunque la mortalidad por esta causa se ha reducido, puede ser un importante problema de salud en ciertas épocas del año. Entre los grupos de agentes biológicos que se pueden encontrar en niños con diarreas están los parásitos, de los cuales no siempre se conoce bien su papel como agente causal. Objetivo: determinar algunas características epidemiológicas de las infecciones parasitarias en niños ingresados con diarrea. Métodos: se realizó un estudio observacional descriptivo en niños ingresados con diarrea en la sala de gastroenterología del hospital pediátrico William Soler de La Habana, desde noviembre de 2006 a octubre de 2007. A todos los niños se les recogieron muestras de heces para estudios parasitológicos y se les llenó un cuestionario con datos clínicos y epidemiológicos. Resultados: se encontró una mayor frecuencia de infecciones por protozoos para todas las edades (p< 0,01); el grupo mayor de 2 años resultó el más frecuente infectado en general (68,52 porciento) y el más parasitado por Giardia lamblia (35,18 porciento), mientras que los lactantes presentaron la menor frecuencia de parasitismo intestinal (18,18 porciento). Las infecciones por protozoos en general y por el complejo Entamoeba histolytica/Entamoeba dispar en particular, fueron más frecuentes en la estación de lluvia que en la de seca (p< 0,05). Por último, se encontró que los niños asistentes a círculos infantiles y a escuelas primarias, presentaron una mayor frecuencia de infección con Giardia lamblia que por Entamoeba histolytica/Entamoeba dispar y Cryptosporidium (p< 0,05). Conclusiones: se encontró un predominio de infecciones por protozoos en niños ingresados con diarreas, las cuales se presentaron más frecuentes en los mayores de 2 años y en la estación de lluvia

Introduction: acute diarrhea is a major cause of mortality in developing countries, and children aged less than five years are the most affected. Despite of decreasing mortality rates in Cuba, this illness may be an important health problem in some periods of the year. Among the groups of biological agents found in children with diarrhea are the parasites but their role as etiological agent is not always well recognized. Objective: to determine some epidemiological characteristics of parasitic infections in hospitalized children due to diarrhea. Methods: an observational descriptive study was performed on children who had diarrhea and were admitted to the gastroenterology service ward in William Soler pediatric hospital in Havana from November 2006 to October 2007. Their stool samples were collected for parasitological studies, and some questionnaires were filled out with corresponding clinical and epidemiological data. Results: the frequency of protozoan infections was higher than that of helminthic ones for all the age groups(p< 0.01), and children aged over 2 years was the most frequently infected with all types of parasites in general (68.52 percent), and with Giardia lamblia (35.18 percent) in particular whereas the infant group was the less frequently infected with intestinal parasites (18.18 percent). The infections caused by protozoa and by Entamoeba histolytica/Entamoeba dispar were more frequent in the rainy season than in the dry season (p< 0.05). Finally, a higher prevalence of infections with Giardia lamblia than with Entamoeba histolytica/Entamoeba dispar or Cryptosporidium was found in day care and primary school children (p< 0.05). Conclusions: a higher prevalence of protozoan infections was observed and they occur more frequently in children aged more than two years old and during the rainy season

Intestinal parasitic infections in suburban government schools, Lak Hok subdistrict, Muang Pathum Thani, Thailand

OBJECTIVE@#To provide baseline information of parasitic infections in 3 suburban government schools, Lakhok subdistrict of Muang Pathum Thani, Thailand.@*METHODS@#This study was conducted between May-June 2010 using simple direct smear and modified formalin ether and from a population of 1 253 in 3 suburban government schools.@*RESULTS@#Total samples of 202 registered and participated. The average of prevalence of infection from 3 schools was 13.9%, there were 13.7%, 14.3% and 13.9% in N, S and R school, respectively with no significant difference between schools (P>0.05). The infection rates did not show significant difference between genders (P>0.05). The highest rate of infection was 20.4% in Pathom 2 (8 years) students and the lowest was 4% in Pathom 1 (7 years) with statistically difference between age groups (P<0.05). The highest prevalence of pathogenic protozoa was Giardia lamblia (G. lamblia) which was found in 50% of infected cases, followed by 25% of Entamoeba histolytica (E. histolytica) and Blastocystis hominis (B. hominis). The highest prevalence of non-pathogenic protozoa was Endolimax nana (E. nana) which was found in 88.9%, followed by 11.1% of Entamoeba coli (E. coli). Mixed infections between Blastocystis hominis (B. hominis) and Endolimax nana (E. nana) were reported at 7.1%. The only helminthic infection found in this study area was hookworm, found in 1 student (3.8%). The formalin ether concentration technique showed a higher efficacy of detection (78%-100%) than the simple direct smear method (0%-50%).@*CONCLUSIONS@#Surveillance of Protozoan infections may need to be focused on suburban areas.

Segunda encuesta nacional de infecciones parasitarias intestinales en Cuba, 2009 / Second national survey of intestinal parasitic infections in Cuba, 2009

Introducción: en Cuba las parasitosis intestinales continúan siendo endémicas, con una mayor frecuencia en zonas rurales y montañosas. Después de haber transcurrido casi 25 años desde la última encuesta nacional, se hizo necesario hacer una nueva encuesta para conocer los índices de prevalencia de las parasitosis intestinales y comparar los resultados obtenidos entre ambos estudios. Tal conocimiento resultaría de gran valor para elaborar estrategias de salud y el diseño de programas de control de las infecciones parasitarias intestinales. Objetivo: determinar los índices actuales de prevalencia de las parasitosis intestinales, y comparar los resultados con los de la encuesta anterior luego de haber transcurrido 25 años. Métodos: se realizó un estudio descriptivo de corte trasversal durante los meses de mayo a agosto de 2009 en una muestra de la población cubana. A cada uno se le recogió una muestra de heces que fue analizada por el método de examen directo, la técnica de concentración de Willis y el examen de Kato-Katz; también se le llenó un cuestionario. Resultados: al comparar los resultados de las encuestas nacionales de infecciones parasitarias intestinales realizadas en 1984 y 2009, se encontró que en general disminuyeron las infecciones por parásitos, tanto los helmintos como los protozoos patógenos, aunque los infectados con comensales aumentaron su frecuencia en la de 2009. También se produjo una disminución de las frecuencias de infecciones por todas las especies de geohelmintos, Trichuris trichiura, Ascaris lumbricoides, ancylostomídeos, y Strongyloides stercoralis, así como por los protozoos patógenos Giardia lamblia y Entamoeba histolytica/E. dispar, y los comensales: Endolimax nana y Entamoeba coli en 2009. La única especie de parásito intestinal que aumentó su frecuencia con respecto a la encuesta de 1984 fue Enterobius vermicularis. En ambos estudios la frecuencia de infección con parásitos o comensales fue mayor en el grupo de 5 a 14 años (edad escolar). Conclusiones: al comparar los resultados de las encuestas nacionales de infecciones parasitarias intestinales realizadas en 1984 y 2009, se encontró que en general disminuyeron las frecuencias de infecciones con parásitos intestinales. El hallazgo en ambos estudios de una frecuencia mayor de infección con parásitos o comensales en el grupo de 5 a 14 años (edad escolar), respalda la recomendación de poner énfasis en los programas de control para las parasitosis intestinales en este grupo de edad.

Introduction: the intestinal parasitic infections are still endemic in Cuba, with a higher frequency in rural and mountain regions. Twenty five years after the last national survey, it deemed necessary to carry out a new national survey in order to know the prevalence of intestinal parasitic infections and to compare the obtained results between both studies. That knowledge would be valuable to work out strategies of health and to design a control program for intestinal parasitic infections in Cuba. Objective: to determine the current prevalence of intestinal parasitic infections in Cuba and to compare these results with those obtained from the previous survey after a 25 year-period. Methods: a cross sectional study was conducted from May to August of 2009 in a sample of Cuban population. A stool sample was collected from each individual, which was analyzed by direct examination, Willis' brine flotation method and the Kato-Katz thick smear technique. Additionally, a questionnaire was administered. Results: the comparison between 1984 and 2009 surveys showed a general decrease of frequencies of intestinal parasitic infections caused by both helminths and pathogenic protozoa; however, the percentage of infections with commensal protozoa increased in 2009. In this last survey, there was observed decline of frequencies of infections with soil transmitted species, Trichuris trichiura, Ascaris lumbricoides, hookworm, and Strongyloides stercoralis and the pathogenic protozoa: Giardia lamblia, Entamoeba histolytica/E. dispar, and the commensals: Endolimax nana and Entamoeba coli. The intestinal parasite Enterobius vermicularis was the only parasitic species that increased the frequency of infections with respect to the 1984 survey. The frequencies of parasitic and commensal infections in both studies were higher in the 5-14 y age group (school age). Conclusions: the comparison between the intestinal parasitic infections surveys of 1984 and 2009 showed a reduction in the frequencies of intestinal parasitic infections in the last survey. The finding in both studies of a higher frequency of pathogenic parasitic infections and commensal infections in the 5-14 y age group (school age) supports the recommendation of making emphasis on the control programs for intestinal parasitic infections in this age group.

Intestinal parasitic infections in HIV and non-HIV infected patients with chronic diarrhea in Thailand.

Chronic diarrhea is a common problem in AIDS patients, and enteric parasites are re-cognized as important causes. This study determined the prevalence of parasitic infections in HIV infected patients with chronic diarrhea. Ninety-one patients with AIDS who presented with chronic diarrhea and 103 patients who were HIV negative were enrolled in the study. Detection of stool parasites was made by microscopy of simple smear, formalin-ether concentration method, modified acid-fast and modified trichrome staining techniques. Species identification of microsporidia spores was made by transmission electron microscopy (TEM). Cases in which serial fecal examinations were negative were subjected to gastroduodenoscopy and/or colonoscopy. Parasitic infections were found in 51 (56%) AIDS patients with chronic diarrhea and in 18 (17%) non-HIV cases (p < 0.001). Microsporidia and Cryptosporidium parvum were the most common parasites found in HIV infected patients and were also significantly more prevalent than in non-HIV infected cases [29% vs 0% for microsporidia, (p < 0.001), and 25% vs 1% for C. parvum, (p < 0.001)]. Species identification of microsporidia spores in 26 patients using TEM revealed Enterocytozoon bieneusi in 19 cases. This study indicated that microsporidia and C. parvum are important pathogenic causes of chronic diarrhea in AIDS patients in Thailand.