A Blue-Green Bloom of Cyanobacteria Leads to an Ocean Beach

A blue-green bloom of cyanobacteria leads to an ocean beach closure.What is the primary concern?

A) Cyanobacteria indicate the presence of fecal matter in the water, which could lead to intestinal illnesses.
B) Cyanobacteria are frequently pathogenic and could infect swimming humans.
C) Liver-damaging toxins produced by cyanobacteria could affect humans who come in contact with the water.
D) Cyanobacteria consume oxygen in the water, and fish begin accumulating toxins as oxygen levels drop.