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Varna Medical Forum

Blastocystosis and prevalence of Blastocystis Hominis invasion in children and adults from the Varna region

Kalina Stoyanova, Tatyana Cvetkova

Abstract

Blastocystis hominis is the most commonly diagnosed protozoan organism in routine stool specimens testing worldwide. In the majority of cases the invasion is asymptomatic, but more studies confirm the pathogenicity of the parasite in immunocompromised and immunocompetent persons. The aim of this study was to reveal the occurrence of B. hominis in different age groups of the population of the Varna region and to determine the prevalence of clinically confirmed cases. Materials and Methods: For a 5-year period a total number of 20 646 children and 17 088 adults, were tested for intestinal parasites, including B. hominis, with fecal wet mount preparation stained with Lugol`s iodine solution.

Results and Discussion: In the investigated patients from the Varna region, B. hominis was diagnosed in nearly 3.28% of the tested samples and is proven to be the most common intestinal protozoa, followed by G. intestinalis (0.59%), Entamoeba coli and other intestinal amoebas (0.25%). The systematic analysis revealed a progressive increase in prevalence with the increasing of age, with the smallest percentage of invasion in children from 0 to 4 years (0.70%) and the highest in the age groups 50-54 years (8.45%), followed by those aged 55-59 (7.72%). Based on diagnostic, clinical and epidemiological criteria blastocystosis was confirmed in 52 cases, therefore, the prevalence of the disease in a 5-year interval was 0.14% ± 0.09%. Regardless of the relatively high frequency of invasion in patients from the Varna region blastocystosis remains a lesser-known disease. Testing for B. hominis and oth er intestinal protozoan pathogens should be included systematically in the differential diagnosis of patients with nonspecific gastrointestinal signs, diarrhea and allergic symptoms, in children and adults alike.


Keywords

B. hominis, blastocystosis, prevalence, intestinal parasitoses

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