cyanobacteria poisoning, poisoning by cyanobacteria, usually as a result of drinking contaminated water. In most cases it is a subacute condition characterized by liver damage with jaundice and sometimes bloody diarrhea and photosensitization. Drinking of heavily contaminated water may cause acute symptoms including muscle tremors, ataxia, dyspnea, cyanosis, and hyperesthesia so that a slight touch may cause convulsions and opisthotonos, which can be fatal. Also called blue-green algae poisoning.