A nightmare scenario

Just saw this headline:

Bird flu jumps to pigs

Headlines I'd like to see:

Bird flu jumps to pigs from 'flying pig' sub-species

Horse flu jumps to pigs via birds, does a run round the track a few times, then back to horses again

Man flu crosses species barrier!

Okay, that last one is a bit improbable. But just imagine if it did! That would be a nightmare scenario.