Resumo

TAYLOR-OROZCO, Viviana et al. Blastocystis sp: EVIDENCE OF ITS PATHOGENIC ROLE. Biosalud [online]. 2016, vol.15, n.2, pp.69-86. ISSN 1657-9550.  https://doi.org/10.17151/biosa.2016.15.2.8.

Blastocystis sp. is a globally distributed parasite which is transmitted by the fecal-oral route by colonizing the gastrointestinal tract of both animals and humans. There are many factors which allow its transmiBion such as poor sanitation, the consumption of contaminated food and vectors propagation. This parasite has awakened scientific and clinical interest in recent years because of its aBociation with disease. However, its pathogen role has not been accurately established. Also, it has been considered as an opportunistic agent due to its high prevalence in immunosuppreBed patients, specifically in those with HIV / AIDS and cancer. Currently, in GenBank database the sequences of 33 different subtypes (STs) have been described even though only 17 subtypes are reported in the literature so far, from which nine have been isolated in humans. Although many studies indicate the subtype 3 (ST3) as the most prevalent, some authors suggest the predominance of ST1 and ST4 in particular areas, suggesting that some subtypes vary depending on the geographical distribution. Several of these STs have been directly related to acute and chronic gastrointestinal symptoms and even with clinical extraintestinal manifestations, being ST3 found with more frequency in symptomatic patients followed by ST1 and ST2 in some cases. Furthermore, mixed infections have been reported of which the most common has been present between ST1 - ST3. In Latin America, and particularly in Colombia, little research has been developed that aims to identify and define the prevalence, coinfection, and pathogenic potential of different forms and known subtypes of Blastocystis sp., therefore the knowledge at hand so far is scarce and unspecific, requiring more studies which allow obtaining more information about it.

Palavras-chave : Blastocystis sp.; pathogenicity; subtypes; symptoms; coinfection.

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