Is Aglaonema plant harmful to cats?

According to the NCSU website they are poisonous and cause severe pain in the mouth when eaten. I checked because our kitten likes to chew on the leaves. It doesn't seem to cause her pain but she does have constant urinary tract infections. When I googled it the webpage below says the "Toxic Principle" is calcium oxalate crystals, the same crystals that cause urinary infections in cats. Coincidence? Let's just say I moved the plant :-P

http:/www.ces.ncsu.edu/depts/hort/consumer/poison/Aglaomo.htm