No, it wouldn't. It's very difficult to produce beer where harmful organisms can multiply. Post-fermentation it's an extremely difficult environment for most organisms.
Yes, it can. But infections by harmful organisms is very difficult to achieve. The common spoilage organisms in beer are all harmless to humans. Here's a good overview http://mmbr.asm.org/content/77/2/157.long
Just the hops alone stop pretty much all gram-positive bacteria except Lactobacillus and a few other harmless ones.
