Low: Process capable of killing most bacteria, some viruses, and some fungi, but not Tuberculosis bacilli (Mycobacterium) or bacterial spores. Intermediate: Process capable of killing Tuberculosis bacilli, vegetative bacteria (bacteria that are not in their spore state), most viruses, and most fungi, but not necessarily bacterial spores. High: Process capable of killing all microorganisms with the exception of high numbers of bacterial spores and prions.