References. 1  Shmerling RH. 2  LeBlond RF, et al., eds. 3  Muscle cramps. 4  Sprains, strains and other soft tissue injuries.
Microorganisms can be, according to their characteristics, divided into several groups: 1  bacteria, viruses, certain fungi and parasites. 2  pathogenic (capable of causing disease), non-pathogenic, and opportunistic (causing disease when they have an opportunity, like in people with low immune system).xamples of bacteria pathogenic for a human are: 1  Staphylococcus aureus, causing skin infections, pneumonia, infection of the heart valves, etc. 2  Streptococcus pyogenes, causing âstrep throatâ, cellulitis, etc. 3  Neisseria gonorrheae, causing gonorrhea.
Pathogens are organisms, frequently microorganisms, or components of these organisms, that cause disease. Microbial pathogens include various species of bacteria, viruses, and protozoa. Many diseases caused by microbial pathogens, and the frequency of these diseases, are a national security issue.