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Plants can play host to a wide range of pathogen types, including viruses, bacteria, fungi, nematodes, and even other plants. [35] Notable plant viruses include the papaya ringspot virus , which has caused millions of dollars of damage to farmers in Hawaii and Southeast Asia, [ 36 ] and the tobacco mosaic virus which caused scientist Martinus ...
The green algae are subdivided into the chlorophytes and charophytes. It is very rare for green algae to become parasitic. [citation needed] Prototheca moriformis belongs to the subdivision Chloroplastida. P. moriformis is a green algae that lacks chlorophyll and has turned to parasitism. It is found in sewage and the soil.
Infectious disease – illness or disorder when pathogenic (disease-causing) microorganisms, such as bacteria, viruses, fungi, or parasites invade and multiply within the body of a host organism and release toxins, causing various clinical symptoms which can potentially lead to severe health complications or even death. Infectious diseases can ...
In parallel, there has been an alarming increase in antimicrobial resistance of bacteria, fungi, parasites and some viruses to multiple existing agents. [14] Antibacterials are among the most commonly used and misused drugs by physicians, for example, in viral respiratory tract infections. As a consequence of widespread and injudicious use of ...
Microorganisms are very diverse. They can be single-celled [1] or multicellular and include bacteria, archaea, viruses, and most protozoa, as well as some fungi, algae, and animals, such as rotifers and copepods. Many macroscopic animals and plants have microscopic juvenile stages.
Infections may be caused by bacteria, viruses, fungi, and parasites.The pathogen that causes the disease may be exogenous (acquired from an external source; environmental, animal or other people, e.g. Influenza) or endogenous (from normal flora e.g. Candidiasis).
A human pathogen is a pathogen (microbe or microorganism such as a virus, bacterium, prion, or fungus) that causes disease in humans.. The human physiological defense against common pathogens (such as Pneumocystis) is mainly the responsibility of the immune system with help by some of the body's normal microbiota.
Bacteriology: the study of bacteria; Mycology: the study of fungi; Protozoology: the study of protozoa; Phycology/algology: the study of algae; Parasitology: the study of parasites; Immunology: the study of the immune system; Virology: the study of viruses; Nematology: the study of nematodes