Abstract
Introduction. Blastocystis sp is a parasitic protozoan found in the intestinal tract of man and some animals, and it is estimated that it infects more than 1,000 million people in the world. In the national parasitism survey, it was reported with a prevalence of 52% in the northern Andean region. The aim of this study was to determine the genotypes of Blastocystis sp associated with different sources of transmission in rural areas of the department of Quindío. Materials and Methods. Forty-two coprological samples were obtained from children between 0 and 14 years of age, 17 from animal feces, 17 from food, 28 from inert surfaces, 15 from soil, 18 from household water and 3 from water sources. DNA extraction and PCR amplification were performed for Blastocystis sp using the SSADNr gene as target. The sequences were aligned with ClustalW and phylogenetic trees were performed with the program (MEGA11). Results. Of the 140 samples collected between coprological samples of children and environmental matrices, we found a prevalence of Blastocystis sp of 23.5% in food, 22.2% in the home network and 4.75% in the child population, there was no statistical evidence implying an association between the presence of this protozoan and sociodemographic variables. Subtype 2 was found associated with infant population and subtype 3 associated with environmental matrices (water and food) and infant population. Conclusions: We report the presence of Blastocystis sp in tomato and carrot, in the home network and infant population in a rural area of the department of Quindío where the associated subtypes were subtype 2 and 3.
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