Spam links injected to RSS feed posts

I can’t find anyone else with this problem which makes me nervous.

I’ve had a few readers tell me that they see plain text spam links inside my posts when viewing through an RSS reader. I’ve tried a few different RSS readers, and each time my posts contain text spam links.

Generally after the first paragraph there is a simple “payday loans” link. But now they’re staring to get more aggressive and have viagra ads, etc.

http://www.terasue.com is the blog.

Everything looks fine on the site itself, but when posts come through RSS something is getting inserted. I’ve reinstalled wordpress from scratch, and deleted all unnecessary plugins.

Thanks for any help you can provide.