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Infection (from Latin infectious) is the action and effect of infecting or becoming infected . This clinical concept refers to the colonization of an organism by external species . These species Colonizers are detrimental to the normal functioning of the host organism.

All multicellular organisms experience some degree of colonization by external species. However, this relationship is symbiotic and has no harmful consequences for the host.

When colonization generates abnormalities (such as pain , irritation, etc.), an infection occurs. The active infection It involves the fight between the host and the infecting organism, which tries to multiply. The passage from a symbiotic colonization to an infection depends on various circumstances and conditions.

An infection begins with the entry of the pathogen into the body and continues with an incubation period. From then on, the type of infection is determined by the amount of germs, their multiplication capacity and their toxicity.

It is known as infectious disease to the clinical manifestation generated by an infection because of the action of virus , bacteria , mushrooms or other organisms.

The malaria It is an example of disease infectious; it is produced by parasites of the genus Plasmodium and has certain mosquitoes as vectors. Another infectious disease is the toxoplasmosis , caused by the protozoan Toxoplasma gondii and transmitted to humans by the cat and other species of felines.

Acquired immunodeficiency syndrome (AIDS) is also an infectious disease. It affects people infected with the virus HIV , transmitted through blood, semen, vaginal secretions and breast milk.

In the field of computing, there is talk of infection when a small program called virus seizes a computer and attacks it, a fact that has a wide variety of consequences, some of which are fatal. Listed below are some of the most curious viruses in history:

* Morris: was developed in 1988 by a student named Robert Morris Jr., and is considered the first worm (from the British term worm), since he took advantage of a back door Unix system for distribution. It is worth mentioning that it affected a large number of users, almost 10 percent of those who had a connection to Internet;

* Melissa: It was scattered in 1998 and directly attacked the Program Word, the Microsoft word processor. Its propagation was done in the form of an attachment via email and, since it was automatically sent to the contacts of infected computers, generated trust in its recipients. Mainly, this macro virus it disabled certain options of the aforementioned application and made modifications to the text documents that were open;

* I Love You: it was an email message that made its recipients believe it contained a love letter as archive attached. Actually, it was a dangerous worm that erased a large number of files from various extensions, including vbs, mp3, css and jpg, and collected certain confidential data from the affected computer, to later send them to its developer;

* Red Code: It was a virus of great repercussion, which attacked millions of users for the first time in 2001. Its destination was the system Microsoft Windows operating, specifically the NT, 2000 and XP versions and its main requirement was that Microsoft IIS (Internet Information Services, a series of services in the form of a computer package, specifically developed for said operating system) will be installed and that a particular patch would not have been applied, which corrected important errors. With regard to its actions, it made certain changes in the system configuration and left open a back door.

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