Cyanobacteria is photosynthetic bacteria, not Extremophiles that belong to a different and more primintive group of bacteria called Archaea. The chloroplasts in green plants originated from symbiosis fusion of CB into algae that later evolved into advanced plants. CB can release toxins, but I am not aware that CB can be parasitic.Cyanobacteria is being increasingly implicated as a factor for long term neurodegenerative diseases such as Alzheimer’s, Parkinson’s, CJD and others. The body can incorporate genes from it which codes for misfolding Tau proteins leading to long term damage and eventual death.
There’s more to this of course but it’s not surprising considering that it’s the original extremophile that ushered in all other life by its exceptional ability to scavenge nutrition.
Poor Elephants, Very Fast Death Factor in action!