Submitted: 16 Dec 2017
Revised: 27 Oct 2018
Accepted: 29 Oct 2018
First published online: 12 Nov 2018
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Int J Enteric Pathog. 2018;6(4):108-112.
doi: 10.15171/ijep.2018.27
  Abstract View: 467
  PDF Download: 223

Original Article

Eosinophils and Parasitic Infections

Mohsen Rahimi 1 ORCiD, Tahere Mohammadzadeh 1,2 * ORCiD, Khadijeh Khanaliha 3 ORCiD

1 Department of Parasitology and Mycology, School of Medicine, Baqiyatallah University of Medical Sciences, Tehran, Iran
2 Health Research Center, Life Style Institute, Baqiyatallah University of Medical Sciences, Tehran, Iran
3 Research Center of Pediatric infectious Diseases, Institute of Immunology and Infectious Diseases, Iran University of Medical Sciences, Tehran, Iran
*Corresponding Author: Tahereh Mohammadzadeh Email:


Background: Eosinophils dysregulate immune responses associated with malignancies, allergic and parasitic diseases especially helminthic infections, though it is infrequently observed with protozoan diseases.

Objective: The aim of the present study was to evaluate and compare the percentage of eosinophils in different parasitic diseases at Baqiyatallah Hospital, Tehran, Iran.

Materials and Methods: One hundred and 72 samples were obtained from 74 and 98 patients with helminthic and protozoan diseases respectively and evaluated. Direct wet mount and formalin ether concentration were used for intestinal parasites identification. Scotch tape test and serological methods were utilized for diagnosis of Enterobius vermicularis and tissue parasites respectively. Eosinophils were counted and six or more percentages were considered as eosinophilia.

Results: In general, in 34 out of 74 helminthic infections (45.9%) and 5 out of 98 protozoan infections (5.1%), an eosinophil level equal or more than 6% was observed. The rate of eosinophilia in helminthic infections were 13/18 (72.2%), 7/11 (63.6%), 3/10 (30%), 2/3 (66.7%), 1/9 (11.11%), 5/13 (38.5%), 3/4 (75%) in the patients with fasciolosis, strongyloidiasis, hymenolepiasis, hookworm infection, enterobiasis, echinococcosis, and trichostrongyliasis, respectively. Concerning the protozoan infections, 3/26(11.5%) and 2/20(10%) of the individuals suffering from giardiasis and blastocystosis showed an eosinophil level higher than normal range, respectively.

Conclusion: As expected, helminthic infections especially fasciolosis and strongyloidiasis were the most important infections correlated with eosinophilia. According to available reports, eosinophilia higher than normal range in giardiasis and blastocystosis is not unexpected.

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