In article wildbilly-7CDA27.10210721032009@c-61-68-245-
199.per.connect.net.au, says...

Latest Scientific American, April '09, article (Saving the Honey Bee,
pg. 40) claims the a virus, Israeli Acute Paralysis Virus (IAPV), and
some mitigating factors like poor nutrition, and exposure to pesticides
are responsible for CCD.

The mitigating factors sound like primary causes to me.

Are they claiming it for a fact, probability or possibility?