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    Some are more common than others, and depending on your CD4 count, some are more likely to occur. Stages of infection. Opportunistic infectionsare infections caused by organisms and usually do not cause disease in a person with a healthy immune system, but can affect people with a poorly functioning or suppressed immune system. infections are a particular danger for people with AIDS. Infection, opportunistic: An infection that grasps the opportunity to cause disease, which is presented when a person's immune system is weak. Opportunistic infection that occurs Opportunistic infections (OI) are caused by micro-organisms (sometimes called opportunists) that under normal circumstances do not cause infections, but in certain clinical contexts, most commonly immunosuppression, may become pathogenic 1. Opportunistic infections (OIs) are defined as infections that are more frequent or more severe because of immune suppression in HIV-infected patients, and they are … (Opportunistic infection, NCI Dictionary) Patients with this syndrome are at an increased risk of opportunistic infections. All content on this website, including dictionary, thesaurus, literature, geography, and other reference data is for informational purposes only. This opportunistic pathogen thrives in the oral environment of a host who is immunologically compromised. Almost any disease can become an opportunistic infection when your immune system is weak. 1. opportunistic infection - any infection caused by a microorganism that does not normally cause disease in humans; occurs in persons with abnormally functioning immune systems (as AIDS patients or transplant patients receiving immunosuppressive drugs) and Pallav Gupta2 (1) Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, India (2) Department of Histopathology, Sir Ganga Ram Hospital, New Delhi, India Bacterial organisms even of low virulence may cause local or disseminated infections in immunocompromised patients. Dictionary » Opportunistic infection Opportunistic infection. The human immunodeficiency viruses (HIV) are two species of Lentivirus (a subgroup of retrovirus) that infect humans.Over time, they cause acquired immunodeficiency syndrome (AIDS), a condition in which progressive failure of the immune system allows life-threatening opportunistic infections and cancers to thrive. Opportunistic infections occur in people with weakened immune systems. opportunistic infection is a topic covered in the Taber's Medical Dictionary.. To view the entire topic, please sign in or purchase a subscription.. Taber’s Cyclopedic Medical Dictionary Online + App from F.A. Open wounds and the respiratory, intestinal, and reproductive tracts are examples of portals of entry. (Idiopathic CD4-Positive T-Lymphocytopenia, NCI Thesaurus) Elucidate the pathogenic mechanisms of HIV-related opportunistic infections. This report updates the last version of the Guidelines for the Prevention and Treatment of Opportunistic Infections (OIs) in HIV-Exposed and HIV-Infected Children, published in 2013. Terms of Use. home/medterms medical dictionary a-z list / opportunistic infection definition. The protozoon Pneumocystis carinii infects nearly everyone at some point in life but never causes disease unless the immune system is severely depressed. Also, one organism can impair external defenses and permit another to enter; e.g., viruses can enhance bacterial invasion by damaging respiratory tract mucosa. (of a microorganism) causing disease only under certain conditions, as when a person's immune system is impaired. These links are (1) the causative agent, which must be of sufficient number and virulence to destroy normal tissue; (2) reservoirs in which the organism can thrive and reproduce; for example, body tissues and the wastes of humans, animals, and insects, and contaminated food and water; (3) a portal through which the pathogen can leave the host, such as the respiratory tract or intestinal tract; (4) a mode of transfer, such as the hands, air currents, vectors, fomites, or other means by which the pathogens can be moved from one place or person to another; and (5) a portal of entry through which the pathogens can enter the body of (6) a susceptible host. The HIV virus itself does not cause death, but the opportunistic infections that occur because of its effect on the immune system can. (of a disease or infection) caused by such an organism: Pneumocystis pneumonia is an … Meaning of opportunistic infection. The classic opportunistic infection never leads to disease in the normal host. The host must be susceptible to the disease, not having any immunity to it, or lacking adequate resistance to overcome the invasion by the pathogens. Davis and Unbound Medicine. Opportunistic infection: An infection that occurs because of a weakened immune system. Medical Author: William C. Shiel Jr., MD, FACP, FACR home > aids AIDS : Acquired immunodeficiency syndrome , a syndrome caused by infection with the human immunodeficiency virus ( HIV ), with ensuing compromise of the body's immune system . Opportunistic infection (medical condition): Opportunistic infections are those infections that are uncommon except … Opportunistic Infections: An infection caused by an organism which becomes pathogenic under certain conditions, e.g., during immunosuppression. opportunistic infection [ ŏp′ər-tōō-nĭs ′ tĭk ] An infection by a microorganism that normally does not cause disease but does so when lowered resistance to infection … (of an organism or infection) affecting someone when they are already ill or weak: The most common opportunistic infection associated with AIDS is a type of pneumonia. intended for use by clinicians and other health-care workers providing medical care for children living with HIV (CLHIV) and children exposed to but not infected by HIV in the United States. Only when the host 's immune system patients with this syndrome are at increased! The protozoon Pneumocystis carinii infects nearly everyone at some point in life but never disease... 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