1.   He said it is believed caused by some kind of chemical compound, possibly manmade or perhaps something like poisonous algae.

2.   State health officials said the water used in the blood-cleaning treatment contained poisonous algae.

3.   State health officials said the water used in the blood-cleansing treatment contained poisonous blue algae.

4.   The fish contained ciguatoxin from poisonous algae they had consumed.