Seroprevalence and risk factors of Toxocara canis infection in children aged 2-15 years from the southwest Iran.

Human toxocariasis (HT) is one of the most prevalent zoonotic diseases with a worldwide distribution. There is no epidemiological study showing the seroprevalence of toxocariasis among children in southwest Iran, Khuzestan Province. Accordingly, this study was designed to estimate the seroprevalence of Toxocara canis (T. canis) IgG antibodies in children (2-15 years old) and assess the main risk factors associated to human infection. In this cross-sectional study, a total of 259 children were invited to participate from the southwest Iran (Abadan and Khorramshahr cities, Khuzestan Province) between April to August 2021. Serum anti-T. canis IgG antibodies were measured using a commercially available enzyme-linked immunosorbent assay (ELISA). A structured questionnaire was also employed to collect some socio-demographic information and probable risk factors associated to T. canis infection. The overall seroprevalence rate of T. canis in children was 7.3% (95% CI = 4.75 - 11.17%). The univariate analysis demonstrated that living in rural communities (P < 0.001), drinking unpurified water (P < 0.001), contact with cat (P = 0.033), consumption of improperly washed vegetables (P = 0.002), and history of drinking water from unsafe sources (P = 0.003) were risk factors associated with T. canis seroprevalence in children. However, after adjusting for confounders, multivariable logistic regression analysis verified that only drinking unpurified water (P = 0.016) remained a significant risk factor. In addition, both univariate (P = 0.032) and multivariate logistic regression analysis (P = 0.037) revealed that seropositivity of T. canis infection was significantly associated with asthma. The current report provides beneficial baseline epidemiological findings regarding the seroprevalence of T. canis in children as a vulnerable group for this infection. This data can be used by health policy makers to plan effective prevention programs and control this neglected infection among high risk subjects.

Intestinal Parasites Infection in Children with Cancer in Ahvaz, Southwest Iran.

BACKGROUND: Infection with intestinal parasites is widespread worldwide, especially in developing countries. Intestinal parasites are known as one of the leading causes of diarrhea in both immunocompetent and immunocompromised subjects, but cancer patients are highly susceptible to contamination, and it can be deadly for them. This study aimed to estimate the prevalence of intestinal parasites in immunocompromised patients in Ahvaz. Material and Methods. In this descriptive cross-sectional pilot case-control study, fecal samples were collected from 52 children with malignancies hospitalized in Baqaei2 hospital in Ahvaz. A questionnaire including demographic information, type of cancer, type of gastrointestinal symptoms, and laboratory diagnosis was completed for each patient. The collected specimens were examined by direct smear, Logul staining, and concentration. RESULT: The 52 stool samples were collected, 46% were female and 54% male. The age range of children enrolled in the study was from 4 months to 16 years. Of these stool samples, 38.38% were infected with a variety of parasitic intestinal infections (helminths and protozoa). In this study, protozoan parasites, Blastocystis (23%), Chilomastix mesnili (1.92%), Endolimax nana (7.7%), and Entamoeba coli (1.92%), and helminth infection, Strongyloides stercoralis (3.84%), were observed and statistical analysis showed that there was a significant relationship between gastrointestinal symptoms and parasitic infection in children with cancer. CONCLUSION: Blastocystis and Endolimax nana are the most prevalent gastrointestinal parasitic protozoans that infect individuals admitted to Baqaei2 Hospital of Ahvaz, Iran. Since parasitic intestinal infections in immunocompromised patients lead to fatal diarrhea, children with parasitic infections must be carefully identified and treated.