Does penguin update affect all sub-domains?

[BeattieGroup]

A UK sub-domain of a big US site got hit by Penguin last week. The two operations are completely separate apart from sharing a parent domain.

The US site also run a multitude of other sub-domains in the same marketplace. Their link profile is not squeaky clean.

The question is, could the actions of the US site, either in bad links, or poor on-site issues, have caused Penguin to hit the UK sub-domain?

Unfortunately I have no access to the US Analytics or rankings data to know if they were hit by Penguin too.

Thanks

[Mark_Jay_Apsey_Jr.]

David-  The US site could be creating the problem but there are alot of sites in europe that are starting to see the effects from penguin over the last few weeks. Depending on which specific day they saw the drop would tell you if it is the US site as oposed to the UK site.

Hope this helps.

Mark