2023-05-26 14:28:48
These experiments, developed under the governance of the Ministry of Agriculture and Food Sovereignty, were conducted by ANSES and the National Veterinary School of Toulouse (ENVT), in partnership with the Interprofessional Committee for Palmipeds with Foie Gras (CIFOG ), local authorities and pharmaceutical laboratories.
The studies were carried out in real field conditions, on the type of ducks used in France for the production of foie gras (mulard ducks), on experimental sites, to check the practical possibilities of implementation in breeding. In addition to this field phase, the studies included each of the experiments carried out in the A3 containment level animal facilities of ANSES’s National Reference Laboratory for Avian Influenza located in Ploufragan (Côtes d’Armor).
The first experiment aimed to study the ability of vaccines to confer clinical protection and reduce virus shedding. The second experiment consisted of evaluating the reduction in viral transmission between vaccinated ducks.
The results of the two studies confirmed the decrease in the excretion of the virus in animals, whether by the respiratory or digestive route. They also made it possible to demonstrate control of the direct transmission of HPAI in the vaccinated animals and the absence of transmission by indirect contact, ie by airborne transmission under the experimental conditions used.
« These vaccines are very effective. When the animals were not vaccinated, an inoculated animal infected another animal every two hours. Conversely, those who were vaccinated were hardly contaminated by their neighbor even in direct contact, in the same pen, with infected droppings.. explains Béatrice Grasland, from ANSES’s national reference laboratory for avian influenza.
This work was taken into account in the development of the vaccination action plan against HPAI announced on May 25 by the Ministry of Agriculture and Food Sovereignty.
Find out more about ANSES’s actions to combat the avian influenza virus
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