PCR-based subtyping of Blastocystis isolates from symptomatic and asymptomatic individuals in a major hospital in Ankara, Turkey

DOĞRUMAN AL F., Yoshikawa H., Kustimur S., Balaban N.

PARASITOLOGY RESEARCH, vol.106, no.1, pp.263-268, 2009 (SCI-Expanded) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 106 Issue: 1
  • Publication Date: 2009
  • Doi Number: 10.1007/s00436-009-1658-8
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.263-268
  • Gazi University Affiliated: Yes


The stool samples obtained from 94 patients with gastrointestinal symptoms and 109 asymptomatic individuals, who checked in due to other reasons, admitted at a major hospital in Ankara, Turkey were examined with native Lugol's iodine, trichrome, and Kinyoun's acid-fast stainings for parasitology examinations and with in vitro culture method for detection of Blastocystis. In a total of 203 stool samples tested, native Lugol's iodine and trichrome stainings could detect 12 (5.9%) and 20 (9.9%) positive samples for Blastocystis, respectively. Conversely, culture method could detect 66 (32.5%) positive samples, and this method was more sensitive compared to the both microscopic examinations (p < 0.001). Among 66 positive samples for Blastocystis, 27 were from symptomatic patients and 39 were from asymptomatic group. Subtypes (STs) were determined by PCR using seven different sequence-tagged site primers. ST3 was the most dominant in both symptomatic and asymptomatic groups and followed by ST1 or ST2. There were mixed infections with STs 1 and 2 or STs 1 and 3 in nine isolates. There was no statistical significance of the distribution of Blastocystis sp. subtypes between symptomatic and asymptomatic individuals (p > 0.05).