Hi, what to you give/do to prevent respiratory disease?

I lost some of my foundation birds for an unknown diseas. Last sunday i paired all of my foundation pairs.But thursday i was only left with half of them these birds were vaccinated and were in healthy condition,all of the sudden this disaster happens.Thursday morning 7.30 am it started one of...

About a week ago we adopted a shelter cat who started sneezing a lot yesterday. Can cats transmit respiratory infections to pigeons? We don't want Phoebe pigeon harmed! Thanks!