This document summarizes spore-forming and non-spore forming gram-positive bacilli. It describes how bacteria form spores to survive harsh conditions and then reactivate. Key spore-forming bacteria discussed are Bacillus and Clostridium. Important pathogenic species include B. anthracis, C. botulinum, and C. tetani. Non-spore formers covered are Corynebacterium, Actinomyces, Listeria, and others. Details are provided on disease pathogenesis and treatment for anthrax, botulism, diphtheria, and listeriosis.