Keep them physically separate for at least 30 days, then they can be introduced.
You need to get both birds vaccinated for Polyomavirus to prevent them from being carriers. If they are carriers, it is easy for you to spread the virus on your clothes, hands, hair etc, when you go visiting other places that have birds.
If they already have the virus, the vaccine will clear the virus and they will no longer be infected, then the vaccine will prevent re-infection. The vaccine is for avian polyomavirus.
