Topics: Microbiology, Flora, pathogenicity, diagnostic microbiology, vaccines, antimicrobial agent, bacteria, bacterial structure, bacteria growth, bacteria metabolism, bacterial genetics, Staphylococci, Streptococci, Gram-Positive Rods, Neisseriae, Gastrointestinal Gram-Negative Rods, Clostridia, Anaerobic Rods, Spirochetes, Mycoplasma, Chlamydiae, Mycobacteria, Actinomycetes, Rickettsia, Ehrlichia, Anaplasma, Coxiella, Helminths, fungi, parasites, protozoa, viruses, DNA virus, Nonenveloped DNA Viruses, Enveloped DNA Viruses, Hepatitis B, Hepatitis D, Positive-Strand RNA Viruses, Retroviruses, Negative-Strand RNA Viruses, Double-Stranded RNA Viruses, Reoviridae, Unconventional Infectious Agents