Brucella melitensis Rev.1 vaccination generates a higher shedding risk of the vaccine strain in Alpine ibex (Capra ibex) compared to the domestic goat (Capra hircus)
2019
Ponsart, Claire | Riou, Mickaël | Locatelli, Yann | Jacques, Isabelle | Fadeau, Alain | Jay, Maryne | Simon, Roland | Perrot, Ludivine | Freddi, Luca | Breton, Sylvain | Chaumeil, Thierry | Blanc, Barbara | Ortiz, Katia | Vion, Colin | Rioult, Damien | Quéméré, Erwan | Sarradin, Pierre | Chollet, Jean-Yves | Garin-Bastuji, Bruno | Rossi, Sophie | École nationale vétérinaire d'Alfort (ENVA) | Plateforme d'Infectiologie Expérimentale (PFIE) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Muséum national d'Histoire naturelle (MNHN) | Infectiologie et Santé Publique (ISP) ; Université de Tours (UT)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Unité de recherche Comportement et Ecologie de la Faune Sauvage (CEFS) ; Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) | Office national de la chasse et de la faune sauvage (ONCFS) | This study was supported and funded by the French Directorate General for Food (DGAL), Ministry of Agriculture and Food (Grant No. 020602002001, 2017-104, France) and the Ministry for an Ecological and Solidary Transition (Grant No. 2102054258, France).
International audience
显示更多 [+] 显示较少 [-]英语. AbstractEpidemiological investigations implemented in wild and domestic ruminants evidenced a reservoir for Brucella in Capra ibex in the French Alps. Vaccination was considered as a possible way to control Brucella infection in this wildlife population. Twelve ibexes and twelve goats were allocated into four groups housed separately, each including six males or six non-pregnant females. Four to five animals were vaccinated and one or two animals were contact animals. Half of the animals were necropsied 45 days post-vaccination (pv), and the remaining ones at 90 days pv. Additional samples were collected 20 and 68 days pv to explore bacterial distribution in organs and humoral immunity. Neither clinical signs nor Brucella-specific lesions were observed and all vaccinated animals seroconverted. Brucella distribution and antibody profiles were highly contrasted between both species. Proportion of infected samples was significantly higher in ibex compared to goats and decreased between 45 and 90 days pv. Two male ibex presented urogenital excretion at 20 or 45 days pv. The bacterial load was higher 45 days in ibexes compared to goats, whereas it remained moderate to low 90 days pv in both species with large variability between animals. In this experiment, differences between species remained the main source of variation, with low impact of other individual factors. To conclude, multiplicative and shedding capacity of Rev.1 was much higher in ibex compared to goats within 90 days. These results provide initial information on the potential use in natura of a commercial vaccine.
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