Microbiologists and geneticists were skeptical towards the scientific plausibility of such a biological agent. The collection serves as an International standard for microbiologists, ecologists and geneticists. He also served as head of the All-Union Society of Microbiologists, Epidemiologists and Infectionists. Aside from the above list of professionals, geographers, sociobiologists, microbiologists, pathologists, and others have contributed. Some microbiologists also classify viruses (and viroids) as microorganisms, but others consider these as nonliving. These experts range from forensic odontologists to forensic microbiologists (See Figure 2). Kierszenbaum was born in San Diego to Argentinian microbiologists during their PHDs. Microbiologists traditionally relied on culture, staining, and microscopy. Cryogenic grinding of plant and animal tissue is a technique used by microbiologists. Some microbiologists have forsaken the general "bacillus" term because of the confusion it can create. According to microbiologists, it can take as few as 100 staphylococci to cause food poisoning.