Une mutation lors de la production du vaccin contre la grippe dans les oeufs de poule a réduit son efficacité en 2016

H3N2 mutation in last year's flu vaccine responsible for lowered efficacy

The below average efficacy of last year's influenza vaccine (which was only 20 to 30 percent effective) can be attributed to a mutation in the H3N2 strain, a new study reports. With the mutation ...

https://www.eurekalert.org/pub_releases/2017-11/uops-hmi110317.php