I've been wondering, what's the Silver Hand's opinion of vampires? The wiki says they have regular contact with them as well as with werewolves, so do they fight them as well?

I always thought the Silver Hand essentially had a personal vendetta against werewolves, and didn't really care about vampires. Vampires were more the Dawnguards business.

Was that on the Wikia or UESP?

They hate werewolves.

There is no dead vampires in any silverhand place.

According to their lore on UESP, they're simply werewolf hunters that sought to rid Skyrim of werewolves, most importantly the Companions.

Looks like the wiki strikes again with more imaginary lore.

Ah, the wiki. More made up nonsense.

UESP: "most likely due to their regular contact with werewolves and vampires"

Well well. This is a first.

I think the Notes tend to be a bit more speculative than the main bits of the UESP, AFAIK there's no evidence in-game of them having any particular interest in vampires, the note is just saying that maybe they come into contact with them and that'd be another reason to carry cure disease potions (esp as SV seems more contagious than lycanthropy).

Nothing in-game even recognizes that they have anything to do with vampires (besides the 9% chance they spawn with vampire dust as random loot). That simple note is pure speculation that they're paranoid of curing diseases all because they carry a few cure disease potions. Which you would think is rather obvious as to why considering they're werewolf hunters. In fact, now I am starting to wonder who put that there and how they even came up with "cure disease potions = THEY MUST FIGHT VAMPERS!".

The Silver Hand are psychologically unstable mass murderers. My thought would be they're too busy piking werewolf heads by the front door to give a [censored] about Vampires.

Silverhand are obsessed with werewolves and have no real interest in bloodsvckers.