You don't think bats exchange viruses between Budapest and London? That's nothing. Viruses in interacting populations are routinely continent wide. Let me fl

You don't think bats exchange viruses between Budapest and London? That's nothing. Viruses in interacting populations are routinely continent wide. Let me flip this around: do you have even one example of a virus within a compatible species spectrum that does not expand across continent scales over the "few year" timeframe we're discussing?