> Ditto for infections and infestations of all types.


I'm assuming this reference is to all known infections since it's possible that a novel pathogen caused CCD.  
It's not uncommon for science to struggle with forensic pathology when pathogens and environmental factors combine to form a lethal 
combination.  White-nose syndrome in bats, which killed 90% of some populations,  is still unsolved and was first found in New York around the same time as CCD was first noticed. It seems the idiopathic nature of CCD will remain for some time although its effect on the zeitgeist may eventually kill more bees than the initial die-off, as well-meaning enthusiasts bent on "saving the bees" have led countless colonies to their death. 

" Colony collapse disorder has resulted in the deaths of more than 10 million beehives in North America since 2007, but still remains fairly mysterious to scientists. Many think it could develop through a combination of factors, including the deleterious effects of man-made pesticides, fertilizers, and other pollutants, along with the homogenization of the bees' diet as farmers increasingly use hives to pollinate monoculture (one crop) fields — eating just one kind of food is not good for most animals, including bees.

The combined effects of these stressors are thought to dampen the bees' immune systems, making them more susceptible to disease and, literally, collapse."

Live Science

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