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There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic and non-genetic hereditary diseases ), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases.
Viruses are by far the most abundant biological entities on Earth and they outnumber all the others put together. [ 89] They infect all types of cellular life including animals, plants, bacteria and fungi. [ 6]: 49 Different types of viruses can infect only a limited range of hosts and many are species-specific.
Epstein–Barr virus infectious mononucleosis (Mono) Fever – usually lasting 14 days; often mild. Sore throat – usually severe for 3–5 days, before resolving in the next 7–10 days. Swollen glands – mobile; usually located around the back of the neck (posterior cervical lymph nodes) and sometimes throughout the body.
List of fictional diseases, diseases found only in works of fiction. Airborne disease, a disease that spreads through the air. Contagious disease, a subset of infectious diseases. Cryptogenic disease, a disease whose cause is currently unknown. Disseminated disease, a disease that is spread throughout the body.
An infectious disease, also known as a transmissible disease or communicable disease, is an illness resulting from an infection. Infections can be caused by a wide range of pathogens, most prominently bacteria and viruses. [ 2] Hosts can fight infections using their immune systems.
Virus classification. Virus classification is the process of naming viruses and placing them into a taxonomic system similar to the classification systems used for cellular organisms . Viruses are classified by phenotypic characteristics, such as genderlogy, nucleic acid type, mode of replication, host organisms, and the type of disease they cause.
The following is a list of genetic disorders and if known, type of mutation and for the chromosome involved. Although the parlance "disease-causing gene" is common, it is the occurrence of an abnormality in the parents that causes the impairment to develop within the child.
The following outline is provided as an overview of and topical guide to concepts related to infectious diseases in humans.. Infection – transmission, entry/invasion after evading/overcoming defense, establishment, and replication of disease-causing microscopic organisms (pathogens) inside a host organism, and the reaction of host tissues to them and to the toxins they produce.