Korean J Parasitol.  2017 Jun;55(3):279-285. 10.3347/kjp.2017.55.3.279.

Molecular Phylogenetics of Trichostrongylus Species (Nematoda: Trichostrongylidae) from Humans of Mazandaran Province, Iran

  • 1Department of Parasitology and Mycology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran.
  • 2Department of Medical Microbiology, School of Medicine, Ardabil University of Medical Sciences, Ardabil, Iran.
  • 3Department of Pharmaceutics, School of Pharmacy, Guilan University of Medical Sciences, Rasht, Iran.
  • 4Department of Animal Sciences, School of Biology, Faculty of Sciences, Tehran University, Tehran, Iran.
  • 5Department of Medical Parasitology and Mycology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran. keiaeshr@tums.ac.ir
  • 6Center for Research of Endemic Parasites of Iran (CREPI), Tehran University of Medical Sciences, Tehran, Iran.


The present study was performed to analyze molecularly the phylogenetic positions of human-infecting Trichostrongylus species in Mazandaran Province, Iran, which is an endemic area for trichostrongyliasis. DNA from 7 Trichostrongylus infected stool samples were extracted by using in-house (IH) method. PCR amplification of ITS2-rDNA region was performed, and products were sequenced. Phylogenetic analysis of the nucleotide sequence data was performed using MEGA 5.0 software. Six out of 7 isolates had high similarity with Trichostrongylus colubriformis, while the other one showed high homology with Trichostrongylus axei registered in GenBank reference sequences. Intra-specific variations within isolates of T. colubriformis and T. axei amounted to 0–1.8% and 0–0.6%, respectively. Trichostrongylus species obtained in the present study were in a cluster with the relevant reference sequences from previous studies. BLAST analysis indicated that there was 100% homology among all 6 ITS2 sequences of T. colubriformis in the present study and most previously registered sequences of T. colubriformis from human, sheep, and goat isolates from Iran and also human isolates from Laos, Thailand, and France. The ITS2 sequence of T. axei exhibited 99.4% homology with the human isolate of T. axei from Thailand, sheep isolates from New Zealand and Iran, and cattle isolate from USA.


Trichostrongylus colubriformis; Trichostrongylus axei; human; PCR; ITS2-rDNA region; phylogenetic analysis; Mazandaran; Iran
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