Zoo birds vs flu

*Bird flu sweeps through zoos with ‘grave implications’ for endangered animals.*

This variant of bird flue will probably die out in a few years, as they generally do — thing is to make sure no species are wiped out in the mean time. I gather zoos are vaccinating some of their animals, but the article does not make it clear why vaccinated animals are still in danger.

It may be helpful to wall off their enclosures with wire screens that no wild birds can fit through.