I can't think of anything that might grow in the beer that could be dangerous. That being said, while safe to drink, I'm not sure it's something you really want to drink. Taste it and find out!
Valor is the better part of not getting exsanguinated ~ Harry Dresden
The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. ~ Terry Pratchett, Diggers