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The way I read it, that power does not grant a special ability to spread diseases. It just means that if the disease is normally of a type that can be spread through contact with an infected person, the antipaladin is still contagious.
That said, I don't see too many rules about contagious diseases, so that wording is probably hypothetical.
Several diseases are contact or inhaled, so any contact or in your face speaking with the bastard is potentially infectious. Handshakes of Slimey Doom and good ol' Bubonic halitosis.
And his own blood smeared on his weapon takes care of the injury vector if licking his weapon was not enough.
Ingested can be a bit harder, but some teenage pranks spring to mind.
Its completely in the power of the ST. The ability allows for the Anti paladin to be immune to the disease. Otherwise passing one the disease is up to the ST. If you wanted rules as to how it might work look up monsters that have diseases and let the Anti paladin contract them and deliver them in the same method as the beast. But again that just a ST call. No written rules exist for PC's who are sick passing on the disease as far as I have found.
But it is a great ability for NPC use. An anti paladin whom has Bubonic plague using seduction to pass it on to village women, whom then pass it one to village men. He then leaves out moving on to the next town..
This could be a fun plot for PC's. Or maybe it touches upon real life a little too much.