Poisonous chemicals. Some pathogenic organisms release powerful toxins when they multiply, and some when they die.
Found on http://www.encyclo.co.uk/local/20605
Poisons either from the environment or wastes accumulating in the blood due to organ failure. E.G. uremic wastes are those toxins that accumulate in the blood when the kidneys fail. Found on https://www.encyclo.co.uk/local/22445