Protozoa are microscopic, single celled animals. One can give rise to 100's of millions in 24 hours. All are single celled. Animal's immune system repels with antibodies. Abbreviates subsequent reactions Lives and causes disease.
Bacteria produce endotoxins that cause disease.
Tetanus no local inflammation but passes along CNS to cause damage- lock jaw and subsequent death. No apparent damage C . Gas gangrene produces widespread local damage by means of their enzymes C . Botulism proliferates in unsterilized canned goods. One of the most deadly poisons known to man.