yes, Dr bill, here is a site that has some info,
http://hbd.org/brewery/library/HonD.html, rhodadendrum, and muntain laurel are especially toxic and honey can be too. but that is very different than botullism, (which is a anarobic bacteria, which is harmless, but the bacteria produces a toxin, that is harmful) and mildew, both of which can "infect" the honey.

the 'toxic honey' is a problems that comes from the nector used to make the honey.