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Licensed Unlicensed Requires Authentication Published by De Gruyter October 15, 2017

Detection of small number of Giardia in biological materials prepared from stray dogs

Leila Esmailikia, Elahe Ebrahimzade, Parviz Shayan and Narges Amininia
From the journal Acta Parasitologica

Abstract

Giardia lamblia is an intestinal protozoa with intermittent and low shedding especially in dogs, and the detection of Giardia is accompanied with problems such as sampling and diagnostic method. The objective of this study was to detection of Giardia in biological materials with low number of parasite using parasitological and molecular methods, and also to determine whether the examined stray dogs harbor known zoonotic genotype of Giardia. For this aim 85 fecal and duodenal samples were studied from which 1 was positive by Trichrome staining of stool, 4 were positive by staining of duodenal samples. The nested PCR analysis with primers derived from 18 SrRNA showed that the specific PCR product could be amplified in 4 stool and 4 duodenal samples. All positive samples in staining analysis were also positive in nested PCR. No amplification could be observed by nested PCR with primers derived from β giardin gene due to the single copy of gene. Interestingly, the extracted DNA from old fixed stained Giardia positive smears could be also amplified with primers derived from 18SrRNA gene. The sequence analysis of nested PCR products showed that they belong to the genotype D. In conclusion, it is to denote that the Trichrome or Giemsa methods were not suitable for the detection of small number of this parasite in stool and the nested PCR with primers derived from 18S rRNA gene can replace the traditional methods successfully. For detection of Giardia in stool, primers derived from β giardin will not be recommended.

Acknowledgment

This research was supported by grants from the University of Tehran. We are grateful to the Research Council of the University of Tehran and the Research Council of the Faculty of Veterinary Medicine of the University of Tehran for financial support under project no. 27927/1/1.

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Received: 2016-7-1
Revised: 2017-5-26
Accepted: 2017-7-5
Published Online: 2017-10-15
Published in Print: 2017-12-20

© 2017 W. Stefański Institute of Parasitology, PAS