‘Cells from hell’ (previously known as Pfeisteria hysteria).

“Pfiesteria piscicida and a second species, Pfiesteria shumwayae, have been implicated as the primary causative agents of well over a billion fish deaths… When human flesh comes in contact with water infested by the Cells, blisters and abscesses can form on the exposed skin as well as on the chest and face. According to researchers at the North Carolina State University, other symptoms of Pfiesteria piscicida exposure are a “drugged” effect; red eyes, severe headaches, blurred vision, nausea/vomiting, asthma-like difficulty breathing, kidney and liver dysfunction, acute short-term memory loss, and serious difficulty being able to read, remember one’s own name, dial a telephone number, or do simple arithmetic…. ability to produce toxins that can aerosolise. In this free-moving form, the toxins can be inhaled to affect more people and animals…”

Shared by my colleague, Dr Chris Hawkins.