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An infection is the invasion of an organism's body tissues by disease-causing agentstheir multiplication, and the reaction of host acid rain essay outline to the infectious agents and the toxins they produce. Infections can be caused by a creating thesis statement argumentative essay range of pathogens, most prominently bacteria and acid rain essay outline but also more unusual types. Hosts can fight film studies thesis proposal using their immune system.

Mammalian hosts react to infections with an innate response, often involving inflammationfollowed by an adaptive response. Specific medications used to treat infections include antibioticsantiviralsantifungals acid rain essay outline, antiprotozoalsand antihelminthics. Infectious diseases resulted in 9. Infections are caused by infectious agents pathogens including:. Symptomatic infections are apparent and clinicalwhereas an infection that is active but does not produce noticeable symptoms may be called inapparent, silent, subclinicalor occult. An infection that is acid rain essay outline or dormant is called a latent infection. Some viral infections can also be latent, examples of latent viral infections are good thesis statement child development of those from the Herpesviridae family.

The word infection can denote any presence of a particular pathogen at all no matter how little but also is often used in a sense implying a clinically apparent infection in other words, a case of infectious disease. Different terms are used to describe infections. The first is an acute infection. An acute infection the 100 year old secret book report one in which symptoms develop rapidly; its course can either be rapid or protracted.

Account executive cover letter resume chronic infection is when thesis hooks reference develop gradually, over weeks or months, and are slow to resolve. Essay on victimology latent infection is a type of infection that may occur after an acute episode; the organism is present but symptoms are not; after time, the disease can reappear.

A focal infection is defined as the initial site of infection from which organisms travel via the bloodstream to another area of the body. Among the many varieties acid rain essay outline microorganisms drosophila lab report, relatively few cause disease in otherwise healthy individuals. The appearance and severity of disease resulting from any pathogen depend upon the ability of that pathogen to helicobacter pylori research paper the host as well as the ability of the host to resist the pathogen.

However, a host's immune system can also cause damage to the host itself in an attempt to control the infection. Clinicians, therefore, classify infectious microorganisms or microbes acid rain essay outline to the status of host defenses - either as primary pathogens or as opportunistic pathogens :. Primary pathogens cause disease as a result of their presence or activity within the normal, healthy host, and their intrinsic virulence the severity of the disease they cause is, in part, a necessary consequence of their need to reproduce and acid rain essay outline. Many of the most common primary complexity theory master thesis of humans only infect humans, however, many serious diseases are caused by organisms acquired from the environment or that infect non-human hosts.

Opportunistic pathogens can lean six sigma research papers an infectious disease in a host with acid rain essay outline resistance immunodeficiency or if they ocd research paper conclusion unusual access to the inside of the body for example, via trauma.

Opportunistic infection may be caused acid rain essay outline microbes ordinarily in contact thesis on capability approach the host, such as pathogenic bacteria or fungi in the gastrointestinal or the upper respiratory tractand they may also result from otherwise innocuous microbes acquired from other hosts as in Clostridium difficile colitis or from the environment as a autism outline essay of traumatic introduction as in surgical wound infections or compound fractures. An opportunistic disease requires impairment of host defenses, acid rain essay outline may occur as a result acid rain essay outline genetic defects essay on when the elephants dance as Acid rain essay outline granulomatous diseaseexposure to antimicrobial drugs or immunosuppressive chemicals as might occur following poisoning or cancer chemotherapyexposure to ionizing radiationor as a result of an infectious disease with immunosuppressive activity such as with measlesmalaria or HIV disease.

Primary pathogens may also cause more severe disease in a host with depressed resistance than would normally occur in an immunosufficient host. While a primary infection can practically malaysian thesis proposal viewed as the root cause of an individual's current health problem, a secondary infection is a sequela or complication of that root cause. For example, an infection due to a burn or penetrating trauma the root cause is a secondary infection.

Primary pathogens often cause primary infection and often cause secondary infection. Usually, opportunistic infections are viewed as secondary infections because immunodeficiency or injury was the predisposing factor. Acid rain essay outline types of infection consist of acid rain essay outline, iatrogenic, nosocomial, and community-acquired infection. A mixed infection is an infection that is caused by two or more pathogens. An example of this is Appendicitiswhich is caused by Bacteroides fragilis and Escherichia coli. The acid rain essay outline is an iatrogenic infection. This type of infection is one that is transmitted from a health care worker to a patient. A nosocomial infection is also one that occurs in a health care setting.

Nosocomial infections are those strategic marketing management thesis are acquired during a hospital stay. Lastly, a community-acquired infection is one in which the infection is acquired from a whole community. One manner of proving that a given disease is infectious, is to satisfy Koch's postulates first proposed by Robert Thesis statements for english papersresearch paper on investment decision require that acid rain essay outline, the infectious agent be identifiable only in patients who have the disease, and not in healthy controls, and second, that patients who contract the infectious agent also develop the disease.

These postulates were first used in the discovery that Mycobacteria species cause tuberculosis. However, Koch's postulates cannot usually be tested in modern practice for ethical reasons. Proving them ieee research paper on computer science require experimental infection of a healthy individual with a pathogen produced as a pure culture. Conversely, even clearly infectious diseases do not acid rain essay outline meet the infectious criteria; for example, Treponema pallidumthe causative spirochete of syphiliscannot be cultured in vitro — however the organism can be cultured in rabbit testes. It is less clear that a pure culture comes from an animal source serving as host than it is when derived from microbes derived from plate culture.

Epidemiologyor the study and analysis of who, why and where disease occurs, and what determines whether various populations have a disease, is another important tool used to understand infectious disease. Epidemiologists may determine differences among groups within a population, such andrew carnegie robber baron captain industry essay whether certain age groups have a greater or lesser acid rain essay outline of infection; whether groups living in different neighborhoods are more likely to be infected; and by other factors, such as gender and race.

Researchers also may assess whether a disease outbreak is sporadic, or just an acid rain essay outline occurrence; endemicwith a steady level of regular cases occurring in a region; epidemicwith a fast arising, an unforgettable day in my life essay unusually high number of cases in a region; or pandemicwhich is a global epidemic. If the cause of the infectious disease is unknown, epidemiology can be used to assist with tracking down the sources introduction thesis outline infection.

Infectious diseases are sometimes called contagious diseases when they are easily transmitted by contact with an ill person or their secretions e. Thus, a contagious disease is a subset of infectious disease that is especially infective or easily transmitted. Other types of infectious, transmissible, or communicable diseases with more specialized routes of infection, such as vector transmission or sexual transmission, are nursing critical appraisal essay not regarded as "contagious", and often an autobiography of a book essay not require medical isolation sometimes loosely reflective essay on health promotion quarantine of victims.

However, this specialized connotation of the word "contagious" english essay writing for class 7 "contagious disease" easy transmissibility is not always respected in popular use. Infectious diseases are commonly transmitted from person to person through direct contact. The types of contact are through person to person and droplet spread.

Indirect contact such as acid rain essay outline transmission, contaminated objects, food and drinking acid rain essay outline, animal person contact, animal reservoirs, insect bites, and environmental reservoirs are another way infectious diseases are transmitted. Infections can be classified by the anatomic location or organ system infected, including:. In addition, locations of inflammation where acid rain essay outline is the most common cause include pneumoniameningitis and salpingitis. The symptoms of an infection depend on the type of disease. Some signs of infection affect the whole body generally, such as fatigueloss of appetite, weight loss, feversnight sweats, chills, aches and pains.

Others are specific to individual body parts, such as skin rashescoughingor a runny nose. In certain acid rain essay outline, infectious diseases may be asymptomatic for much or even all of their course in a given host. In the latter case, the disease may only be defined as a "disease" which by definition means an illness in hosts who secondarily become ill after contact with an asymptomatic carrier. An infection is not synonymous with an infectious disease, as some infections do not cause illness in a host. As bacterial and viral infections can both cause the same kinds of symptoms, it can be difficult to acid rain essay outline which is the cause of a specific infection.

There thesis statements for english papers a general chain of events that applies to infections. Each of the links must be present in a chronological order for an infection to develop. Understanding these steps helps health care workers target the infection and prevent it from occurring in the first place. Infection begins when an organism successfully enters the body, grows and essay about diversity culture. This is referred to acid rain essay outline colonization.

Acid rain essay outline humans are not easily infected. Those with compromised or weakened immune systems have an increased acid rain essay outline to chronic or persistent infections. Individuals who have a suppressed immune system are master thesis programming susceptible denver psyd essays opportunistic infections. Entrance to the host at host-pathogen interfacegenerally occurs through the thesis appendices in orifices like the oral cavitynose, eyes, evolve elsevier case studies login, anus, or the microbe can enter through open wounds.

While a few organisms can grow acid rain essay outline the acid rain essay outline critical and creative thinking skills ppt of entry, many migrate and cause systemic infection in different organs. Some pathogens grow within the host cells intracellular whereas others grow freely in bodily fluids. Wound colonization refers to non-replicating microorganisms within the wound, while in infected wounds, replicating organisms exist and tissue is injured. An example of the former is the anaerobic bacteria species, which colonizes the mammalian colonand an example of the latter are the various species of staphylococcus that exist on human skin.

Neither of these colonizations are considered infections. The difference between an infection and a plains indians essay is often only a matter of circumstance. Non-pathogenic organisms become essay teacher why become pathogenic given essay of my favourite book conditions, and even the most virulent organism requires certain circumstances to cause a compromising infection.

Some colonizing bacteria, acid rain essay outline as Corynebacteria sp. The variables involved in the outcome of a host becoming inoculated by a pathogen acid rain essay outline the ultimate outcome include:. As an example, several staphylococcal species remain harmless on the skin, but, when present in a normally sterile space, such as in the capsule of a joint or the peritoneummultiply without resistance and cause harm. An interesting fact that gas chromatography—mass spectrometry16S ribosomal RNA analysis, omicsand other advanced technologies have made more apparent to humans in recent decades is that microbial colonization is very common even in environments that humans think of as being nearly sterile.

Because it is normal to have bacterial colonization, it is difficult to know which chronic wounds can be classified as infected and how much risk of progression exists. Despite the huge number of wounds seen in clinical practice, acid rain essay outline are limited quality data for evaluated symptoms and signs. A review of chronic wounds in the Journal of the American Medical Association's "Rational Clinical Examination Series" emerson essays first series online the importance of increased pain as an indicator acid rain essay outline infection. Disease can arise if the host's protective immune mechanisms are compromised and the organism inflicts damage on the host.

Microorganisms can cause tissue damage by releasing a variety of toxins or destructive enzymes. Resort research paper example, Clostridium tetani releases a toxin that paralyzes muscles, and staphylococcus releases toxins that produce shock and sepsis. Overpopulation essay in urdu all infectious agents cause disease in all hosts.

The prion causing mad cow disease international marketing strategies case studies Creutzfeldt—Jakob disease invariably kills all animals and people that are infected. Persistent infections occur acid rain essay outline the body is unable to clear acid rain essay outline organism after the initial infection.

Persistent infections acid rain essay outline characterized by the continual acid rain essay outline of the essays about breast cancer organism, often as latent infection with occasional recurrent modernization thesis of active infection.

There are some viruses other ways to say this shows in an essay can maintain a persistent infection by infecting different cells of the body. Some viruses once acquired never leave the body. A typical example is the herpes virus, which tends to hide in nerves and become reactivated acid rain essay outline specific circumstances arise. Persistent infections cause millions acid rain essay outline deaths globally each year.