Vampires, polymorph, and swim speeds

[Tinalles]

The vampire template says:

PRD wrote:

Each round of immersion in running water inflicts damage on a vampire equal to one-third of its maximum hit points—a vampire reduced to 0 hit points in this manner is destroyed.

And later it says:

PRD wrote:

If the base creature has a swim speed, the vampire is not unduly harmed by running water.

If a vampire gains a swim speed via a polymorph effect, does that remove the damage penalty for immersion in running water?

Or is that based strictly on the creature as it was at the time of death?

[Ipslore the Red]

Polymorph spells say they don't change the base creature's type, so I'd say it's the latter.

[Mojorat]

Unread can't be subjected to polymorphing effects. In the case of vampires they have a specific power which ignores this. However bats and wolves don't have swim speeds.

[Legowaffles]

Mojorat wrote:

Unread can't be subjected to polymorphing effects. In the case of vampires they have a specific power which ignores this. However bats and wolves don't have swim speeds.

Polymorph Any Object works on Undead. So they can polymorph into something with a swim speed. I do however, agree with Ipslore.

The Vampire template defines the base creature as the creature prior to the template being applied.

Polymorphing does not change the base creature's type.

[Tinalles]

I don't see anything in the undead entry about immunity to polymorph effects.

Are you thinking of the immunity to any effect requiring a Fort save unless it works on objects? Because that only renders undead immune to effects that allow a Fortitude save, and there are plenty of personal-range polymorph spells that don't. Example: Alter Self allows no save. Nor does Beast Shape.

However, I'll accept Ipslore's answer and the general consensus: vampires can't dodge the running water weakness via polymorph spells because they don't change the creature's base type. Thanks.