Epidemiology and Health

Original Article

Copro-molecular diagnosis of the Toxoplasmatinae subfamily in dog and cat populations in northern Iran: Leila Izadi, Shahabeddin Sarvi, Seyed Abdollah Hosseini, Afsaneh Amouei, Mehdi Sharif, Mohammad Taghi Rahimi, Tooran Nayeri, Ahmad Daryani; Epidemiol Health. 2020;42:e2020074. Published online December 4, 2020; DOI: https://doi.org/10.4178/epih.e2020074

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Abstract

OBJECTIVES
The oocysts of the Toxoplasmatinae subfamily (Neospora caninum, Hammondia hammondi and H. heydorni, and Besnoitia besnoiti) are morphologically similar to Toxoplasma gondii, and indistinguishable from each other. This study investigated the prevalence of the Toxoplasmatinae subfamily in dog and cat fecal samples using a nested polymerase chain reaction method.

METHODS

Overall, 200 fecal samples from domestic dogs (n=120) and cats (n=80) were collected from 15 farms in northern Iran. The samples were homogenized in 2.5% potassium dichromate solution and subsequently concentrated with sucrose solution. DNA was extracted from samples using a genomic DNA kit. Specific primers and the 18S rDNA gene were used to screen and detect all Toxoplasmatinae oocysts.

RESULTS

Overall, 2.5% (3 of 120) and 22.5% (18 of 80) of the fecal samples collected from dogs and cats were infected with Toxoplasmatinae. In dogs, 2 samples were positive for N. caninum and 1 sample was positive for T. gondii. In cats, all 18 positive samples belonged to T. gondii. No contamination with H. heydorni was observed in dog fecal samples or H. hammondi and B. besnoiti in cat fecal samples. A phylogenetic analysis revealed that the T. gondii (cat) and N. caninum (dog) found had similarities with parasites reported from other regions of the world.

CONCLUSIONS

This is the first study to provide data on the epidemiology of Toxoplasmatinae oocysts in Iran. The findings suggest that public-health monitoring for the effective control of feces from cats and dogs and improved pet hygiene habits are needed.

Summary

Citations

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Prevalence of Toxoplasma gondii in Endangered Wild Felines (Felis silvestris and Lynx pardinus) in Spain
Pablo Matas Méndez, Isabel Fuentes Corripio, Ana Montoya Matute, Begoña Bailo Barroso, Rebeca Grande Gómez, Ariadna Apruzzese Rubio, Francisco Ponce Gordo, Marta Mateo Barrientos
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Endoparasites of European Wildcats (Felis silvestris) in Greece
Anastasia Diakou, Despina Migli, Dimitris Dimzas, Simone Morelli, Angela Di Cesare, Dionisios Youlatos, Petros Lymberakis, Donato Traversa
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Reviews

A systematic review and meta-analysis of the genetic characterization of human echinococcosis in Iran, an endemic country: Abolghasem Siyadatpanah, Davood Anvari, Amir Emami Zeydi, Seyed Abdollah Hosseini, Ahmad Daryani, Shahabeddin Sarvi, Christine M. Budke, Reza Esmaeelzadeh Dizaji, Mohammad Ali Mohaghegh, Mohammad Hasan Kohansal, Samira Dodangeh, Reza Saberi, Shirzad Gholami; Epidemiol Health. 2019;41:e2019024. Published online June 15, 2019; DOI: https://doi.org/10.4178/epih.e2019024

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Abstract PDF

Abstract

Human echinococcosis is an infectious disease caused by tapeworms belonging to the species Echinococcus. This parasite has a worldwide distribution and is considered a neglected tropical disease by the World Health Organization. Due to the diversity of Echinococcus spp. hosts, as well as variation in geographical, climatic, and socio-ethnic conditions, the question of the strains or genotypes of Echinococcus spp. that are involved in human infections is important. The aim of this study was to provide a summary of the available data on genotypes of Echinococcus obtained from the Iranian population. Four international databases (PubMed, Scopus, Science Direct, and Web of Science) and 4 Persian databases (Magiran, Scientific Information Database, Iran Medex, and IranDoc) were searched for cross-sectional studies that reported the genotypes of Echinococcus spp. in human echinococcosis cases using molecular methods in Iran through July 2018. The Newcastle-Ottawa Scale was used to assess the quality of the selected studies. A total of 559 cases of human cystic echinococcosis were reported in the 21 included articles. The majority of cases belonged to genotype G1 (89.2%; 95% confidence interval [CI], 80.1 to 95.8), genotype G6 (8.2%; 95% CI, 2.8 to 15.9), and genotype G3 (2.3%; 95% CI, 1.1 to 3.9). Since genotype G1 of Echinococcus appears to be the most prevalent genotype affecting humans in Iran, disease control initiatives aimed at sheep intermediate hosts may be the most beneficial. In addition, educational programs and serological screening in individuals may help reduce the national impact of the disease.

Summary

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Seroprevalence of Neospora caninum Infection in Dog Population Worldwide: A Systematic Review and Meta-analysis
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Congenital toxoplasmosis among Iranian neonates: a systematic review and meta-analysis: Shahabeddin Sarvi, Tooran Nayeri Chegeni, Mehdi Sharif, Mahbobeh Montazeri, Seyed Abdollah Hosseini, Afsaneh Amouei, Zahra Hosseininejad, Davood Anvari, Reza Saberi, Shaban Gohardehi, Ahmad Daryani; Epidemiol Health. 2019;41:e2019021. Published online May 17, 2019; DOI: https://doi.org/10.4178/epih.e2019021

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Abstract PDF Supplementary Material

Abstract

Toxoplasmosis is a serious zoonotic disease that can lead to abortion and congenital disorders and has a widespread global distribution in humans and animals. The objective of this review was to investigate the incidence of toxoplasmosis in Iranian neonates in order to obtain a comprehensive assessment of the overall situation of the disease for use in developing future interventions. Original studies investigating the incidence of Toxoplasma gondii infections in Iranian neonates were systematically searched in a number of English-language and Persian-language electronic databases. The search process resulted in the inclusion of a total of 11 studies in the systematic review, 10 of which were entered into the meta-analysis. The reviewed articles included 2,230 Iranian neonates investigated through January 1, 2018. Based on the retrieved studies, the overall weighted incidence rates of toxoplasmosis in the Iranian neonatal population and neonates with suspected congenital toxoplasmosis were estimated to be 0.64% (95% confidence interval [CI], 0.31 to 1.09) and 4.10% (95% CI, 2.68 to 5.77), respectively, using a fixed-effects model. The findings of the reviewed studies demonstrate that the incidence of toxoplasmosis is high in Iranian neonates. Accordingly, it can be concluded that toxoplasmosis is a serious public health concern that has been ignored by the Ministry of Health. Therefore, it is essential to perform further studies, in addition to implementing screening and detection programs, using standardized methods to estimate the incidence of toxoplasmosis in Iran and to determine its associated risk factors.

Summary

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Original Article

Geospatial analysis and epidemiological aspects of human infections with Blastocystis hominis in Mazandaran Province, northern Iran: Shabnam Asfaram, Ahmad Daryani, Shahabeddin Sarvi, Abdol Sattar Pagheh, Seyed Abdollah Hosseini, Reza Saberi, Seyede Mahboobeh Hoseiny, Masoud Soosaraei, Mehdi Sharif; Epidemiol Health. 2019;41:e2019009. Published online March 28, 2019; DOI: https://doi.org/10.4178/epih.e2019009

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Abstract PDF

Abstract

OBJECTIVES
Blastocystis hominis is a very common large intestinal protozoan with global prevalence in humans and non-human hosts. No precise statistics exist regarding the geographical distribution of Blastocystis that would enable the identification of high-risk communities. Therefore, the current research aimed to characterize the spatial patterns and demographic factors associated with B. hominis occurrence in northern Iran.

METHODS

The current study was performed among 4,788 individuals referred to health centers in Mazandaran Province, from whom stool samples were obtained. Socio-demographic data were gathered using a questionnaire. Samples were examined by a direct wet mount, the formalin-ethyl acetate concentration technique, and trichrome staining. Moran local indicators of spatial association and a geographically weighted regression model were utilized to analyze the results.

RESULTS

Generally, the infection rate of Blastocystis parasites was 5.2%, and was considerably higher in the age group of 10-14 years (10.6%) than in other age groups (p=0.005). Our data showed important associations between the occurrence of B. hominis and age, residence, job, contact with domestic animals, anti-parasitic drug consumption, and elevation above sea level (p<0.001).

CONCLUSIONS

The current study characterized for the first time the infection rate and risk of B. hominis in the north of Iran, and produced a prediction map. It is expected that this map will help policymakers to plan and implement preventive measures in high-risk areas and to manage already-infected patients.

Summary

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