Two vaccines tested in France have proved "very effective" in protecting ducks from bird flu. After a lull of a month and a half, the virus has begun to flare up again since early May in the Southwest.
The French experiment involved a few thousand ducks, vaccinated or not. The two vaccines, with "very similar" results, have also "almost stopped direct transmission" and "abolished" indirect transmission, by air, that is to say potentially from one barn to another, experts say.