An oral recombinant vaccine in dogs against Echinococcus granulosus, the causative agent of human hydatid disease: a pilot study

Dogs are the main source of human cystic echinococcosis. An oral vaccine would be an important contribution to control programs in endemic countries. We conducted two parallel experimental trials in Morocco and Tunisia of a new oral vaccine candidate against Echinococcus granulosus in 28 dogs. The v...

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Veröffentlicht in:PLoS neglected tropical diseases 2008-01, Vol.2 (1), p.e125-e125
Hauptverfasser: Petavy, Anne-Francoise, Hormaeche, Carlos, Lahmar, Samia, Ouhelli, Hammou, Chabalgoity, Alejandro, Marchal, Thierry, Azzouz, Samira, Schreiber, Fernanda, Alvite, Gabriela, Sarciron, Marie-Elisabeth, Maskell, Duncan, Esteves, Adriana, Bosquet, Georges
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container_title PLoS neglected tropical diseases
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creator Petavy, Anne-Francoise
Hormaeche, Carlos
Lahmar, Samia
Ouhelli, Hammou
Chabalgoity, Alejandro
Marchal, Thierry
Azzouz, Samira
Schreiber, Fernanda
Alvite, Gabriela
Sarciron, Marie-Elisabeth
Maskell, Duncan
Esteves, Adriana
Bosquet, Georges
description Dogs are the main source of human cystic echinococcosis. An oral vaccine would be an important contribution to control programs in endemic countries. We conducted two parallel experimental trials in Morocco and Tunisia of a new oral vaccine candidate against Echinococcus granulosus in 28 dogs. The vaccine was prepared using two recombinant proteins from adult worms, a tropomyosin (EgTrp) and a fibrillar protein similar to paramyosin (EgA31), cloned and expressed in a live attenuated strain of Salmonella enterica serovar typhimurium.In each country, five dogs were vaccinated with the associated EgA31 and EgTrp; three dogs received only the vector Salmonella; and six dogs were used as different controls. The vaccinated dogs received two oral doses of the vaccine 21 d apart, and were challenged 20 d later with 75,000 living protoscoleces. The controls were challenged under the same conditions. All dogs were sacrificed 26-29 d postchallenge, before the appearance of eggs, for safety reasons.We studied the histological responses to both the vaccine and control at the level of the duodenum, the natural localization of the cestode. Here we show a significant decrease of parasite burden in vaccinated dogs (70% to 80%) and a slower development rate in all remaining worms. The Salmonella vaccine EgA31-EgTrp demonstrated a high efficacy against E. granulosus promoting its potential role in reducing transmission to humans and animals.
doi_str_mv 10.1371/journal.pntd.0000125
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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited: Petavy A-F, Hormaeche C, Lahmar S, Ouhelli H, Chabalgoity A, et al. (2008) An Oral Recombinant Vaccine in Dogs against Echinococcus granulosus, the Causative Agent of Human Hydatid Disease: A Pilot Study. 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subjects Animals
Antigens, Helminth - genetics
Antigens, Helminth - immunology
Antigens, Helminth - metabolism
Developing countries
Dogs
Echinococcosis - immunology
Echinococcosis - parasitology
Echinococcosis - prevention & control
Echinococcus granulosus - genetics
Echinococcus granulosus - immunology
Echinococcus granulosus - pathogenicity
Enzyme-Linked Immunosorbent Assay
Experiments
Female
Humans
Immunoglobulin A - immunology
Immunoglobulin E - immunology
Immunoglobulin G - immunology
Immunology/Immune Response
In Vitro Techniques
Intestinal Mucosa - metabolism
Intestines - parasitology
Intestines - ultrastructure
LDCs
Livestock
Lymphocytes
Male
Microscopy, Electron, Transmission
Morocco
Parasites
Proteins
Public health
Public Health and Epidemiology/Environmental Health
Recombinant Proteins - genetics
Recombinant Proteins - immunology
Recombinant Proteins - metabolism
Salmonella
Salmonella typhimurium - genetics
Salmonella typhimurium - metabolism
Salmonella Vaccines - immunology
Sheep
Tropical diseases
Tropomyosin - genetics
Tropomyosin - immunology
Tropomyosin - metabolism
Tunisia
Vaccines
Vaccines - administration & dosage
Vaccines - biosynthesis
Vaccines - genetics
Vaccines - immunology
Vaccines, Synthetic - administration & dosage
Vaccines, Synthetic - biosynthesis
Vaccines, Synthetic - genetics
Vaccines, Synthetic - immunology
Worms
title An oral recombinant vaccine in dogs against Echinococcus granulosus, the causative agent of human hydatid disease: a pilot study
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