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Protective capacity of cercarial transformation fluid alone or in combination with crude cercarial antigen against challenge infections of Schistosoma mansoni in mice

Published online by Cambridge University Press:  28 January 2016

M.Z. El Azzouni ,
R.F. Mady ,
M.R. Gaafar ,
F.M. Arafa  and
A. Elhadidi
M.Z. El Azzouni
Affiliation:
Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Egypt
R.F. Mady*
Affiliation:
Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Egypt
M.R. Gaafar
Affiliation:
Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Egypt
F.M. Arafa
Affiliation:
Department of Medical Parasitology, Faculty of Medicine, Alexandria University, Egypt
A. Elhadidi
Affiliation:
2Department of Clinical Pathology, Faculty of Medicine, Alexandria University, Egypt
*
*E-mail: [email protected]
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Abstract

Schistosomiasis is the second major parasitic disease in the world after malaria. It affects 201.5 million cases in Africa alone. The aim of this research was to explore alternative vaccination strategies against experimental schistosomiasis mansoni. We assessed the effect of cercarial transformation fluid (CTF) singly and in combination with crude cercarial antigen (CCA) using alum as an adjuvant. The combined antigens gave the best results, as evidenced by a significant reduction in the worm load (62.07%), tissue egg count (78.16%, 86.46%) in liver and intestine respectively, and hepatic granuloma size (29.96%). Scanning electron microscopy revealed changes in the tegument, in the form of roughness and appearance of vesicles and furrows between the tegumental tubercles. Also, resorption of the ventral sucker and dimples replacing its spines were observed. The female tegument was irregular and its posterior end showed loss of spines and sensory bulbs. Moreover, there was a significant decrease in liver enzymes (alanine transaminase (ALT) and aspartate transaminase (AST)) compared to infected control mice. A significant elevation in CD4+T-lymphocytes, denoting amelioration of the immune status, in mice that received combined antigens was also observed. It can be concluded that combined antigens demonstrate potential as a vaccine against Schistosoma mansoni.

Type
Research Papers
Information
Journal of Helminthology , Volume 91 , Issue 1 , January 2017 , pp. 35 - 42
Copyright
Copyright © Cambridge University Press 2016 

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