A pathogen (Greek pathos (suffering/emotion) and gene (to give birth to)) or infectious agent is a biological agent that causes disease or illness to its host.[1] The term is most often used for agents that disrupt the normal physiology of a multicellular animal or plant. However, pathogens can infect unicellular organisms from all of the biological kingdoms. The term pathogen is derived from the Greek παθογένεια, "that which produces suffering." There are several substrates and pathways where by pathogens can invade a host; the principal pathways have different episodic time frames, but soil contamination has the longest or most persistent potential for harboring a pathogen. The body contains many natural defenses against some of the common pathogens (such as Pneumocystis) in the form of the human immune system and by some "helpful" bacteria present in the human body's normal flora. However, if the immune system or "good" bacteria is damaged in any way (such as by chemotherapy, human immunodeficiency virus (HIV), or antibiotics being taken to kill other pathogens), pathogenic bacteria that were being held at bay can proliferate and cause harm to the host. Such cases are called opportunistic infections. Some pathogens (such as the bacterium Yersinia pestis, which may have caused the Black Plague, the Variola virus, and the malaria protozoa) have been responsible for massive numbers of casualties and have had numerous effects on afflicted groups. Of particular note in modern times is HIV, which is known to have infected several million humans globally, along with Severe Acute Respiratory Syndrome (SARS) and the Influenza virus. Today, while many medical advances have been made to safeguard against infection by pathogens, through the use of vaccination, antibiotics, and fungicide, pathogens continue to threaten human life. Social advances such as food safety, hygiene, and water treatment have reduced the threat from some pathogens.
virus, fungus, bacteria
A Redwood is not an organism, however it is a type of tree. There are three types of redwoods: the giant sequoia, the dawn redwood, and the coast redwood.
Mutualism-Both organisms benefitCommensalism-One organism benefits, and the other is not affected in any manner.Parasitism-One organism benefits, and the other is harmed.
Fungi can cause respiratory tract infection when inhaled. The spores finds its way in a warm-moist environment, starts to grows, and later blocks small airways.
there r many types of microorganism which can cause infection in humen mainly 1.virus 2.bacteria 3.fungi etc among viral infection deadliest are HIV, rabies,viral hepatitis,chickungunya ,dengue etc. bacteria infection includes septicemia, pyemia,soft tissue infection, meningitis,TB,endocarditis,tetanus etc. fungal infection includes candida infection,taenia infection i.e. opportunistic infection in immunocompromised patients.
An unicellular organism is an organism that does not have a nucleus. Two types of these organism is bacteria and archaea.
A change in the DNA can cause three types of changes: a beneficial change (organism does better than others), a deadly change (kills the organism) or a neutral change (not better/not deadly).
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Three types of fungus are involved in most skin infections: Trichophyton, Epidermophyton, and Microsporum
There are several types of microbes that could cause infection and they may be acute chronic or latent infections. A microbe that could cause an acute infection is rhinovirus, one that could cause a chronic infection is hepatitis C and one that could cause a latent infection is herpes zoster.
There are three types of plate movements that can cause earthquakes. Lateral, convergent, and divergent.
Mutualism-Both organisms benefit Commensalism-One organism benefits, and the other does not benefit or get harmed Parasitism-One organism benefits, and the other is harmed.
None. The common cold is a viral infection.
the terrain, soil, living conditions must exist.
A Redwood is not an organism, however it is a type of tree. There are three types of redwoods: the giant sequoia, the dawn redwood, and the coast redwood.
it is in the intestines and can help digest food, but some types can get into your blood stream and cause an infection.
yes nearly all out of the 5839 different types of bacteria causes a very harmful disease that has the symptoms of vomiting head ache runny nose light headed feeling diarrhoea bladder infection eye infection and in serious cases you may become paralyzed
There are three types of commensalism which is the situation where one organism benefits, the other party is unaffected (no harm/no benefit). There is phoresy which one organism uses the other for transportation, inquilism when one organism provides permanent shelter, and metabiosis where one organism inadvertently makes life easier for another organism.