Lifelong immunity from natural infections
 

Interestlingly, the immunity from an HPV infection is
actually less than the immunity from the vaccine and
doesn't last as long:

http://scienceblogs.com/erv/2010/04/..._infection.php

(The paper isn't published yet.)

Oh, by the way: HPV is orally transmissible and appears to
account for a large share of neck-and-throat cancers.

--
| The brighter the stupid burns, the more |
| chance that someone will see the light. |
+- D. C. Sessions -+