powerful neurotoxin leading to death from botulism Mycobacterium tuberculosis — the causative agent of most cases of tuberculosis Mycobacterium leprae — the bacterium that causes leprosy (Hansen's disease) Yersinia pestis — pneumonic, septicemic, and the notorious bubonic plagues (Black Death) Rickettsia prowazekii — the etiologic agent of typhus fever Bartonella spp. Spanish influenza virus Entamoeba histolytica virus '' amoeba or amoebiasis See also Cancer bacteria Emerging Pathogens Institute Oncovirus List of clinically important bacteria Lists of diseases List of human diseases associated with infectious pathogens List of infectious diseases List of parasites of humans References External links Infectious Disease -- University of Arizona (microvet.arizona.edu) Pronunciation Guide to Microorganisms Microbiology