[Hizonner]

It "persists in the mouth indefinitely".

It's "been in the mouths of fewer than 15 people".

This was in 2003, so I'm guessing they're not all dead.

I'll stake 'em a box of cotton swabs...

[mlyle]

Indefinitely may not be 20 years. That's a long time for selective pressure and rare events causing winnowing of mouth bacterial amounts.

[cdchn]

Saliva transplant.

[nayaketo]

yum