The Macquarie Dictionary

virulent

/'viruhluhnt/ adjective 1.  actively poisonous, malignant, or deadly: a virulent poison, a virulent form of a disease. 2.  Medicine highly infective; malignant or deadly. 3.  Bacteriology of the nature of an organism causing specific or general clinical symptoms. 4.  violently or venomously hostile. 5.  intensely bitter, spiteful, or acrimonious. [ME, from L virulentus poisonous. See virus] --virulently, adv.

I'd have probably used a word more like "lurid", or "violent", but I guess Lynn has a perfectly expedient grip on the English language.

Jason =)