medications used to stop or slow the growth of bacteria in the body, allowing the body's immune system to get back in control
disorders characterized by inflammation and destruction of the body's tissues caused by the body's own immune system
single-celled microorganisms that do not have a defined nucleus and are found virtually everywhere
the count of a certain type of white blood cells; used to assess the magnitude of injury to immune system (for instance, to determine when to initiate therapy and monitor the effectiveness of HIV and AIDS treatment)
presence of bacteria in a human host that is not part of the normal flora; often resides in the host without causing disease unless overgrowth occurs
a condition of the body in which there is abnormal functioning resulting from the effects of hereditary, infection, diet, or environment
a greater than normal number of cases of a disease in an area within a particular period (occurring in outbreaks)
plant-like microorganisms that lack chlorophyll and need to live off of a food source that is either dead or alive
having an immune system that possesses the ability to mount a normal immune response
having an immune system that is weakened by disease, such as HIV, or as a result of a treatment, such as with chemotherapy medications given to treat patients with cancer. The risk of susceptibility to infections is increased.
a condition resulting from a defective immune mechanism; may be primary, due to a defect in the immune mechanism itself, or secondary, dependent upon another disease process
suppression of the immune response, as by drugs or radiation, in order to prevent rejection of a graft or transplant or to control autoimmune disease. It is also known as immunodepression.
contamination of any body tissue and organ by an invading organism or foreign substance, such as a microorganism
the study of very small or microscopic organisms of either animal (bacterial, protozoa) or plant (fungus, molds) origin.
a unit of length, equal to one-millionth of a meter; previously known as a micron (10^-6 meter)
an abnormally low white blood cell count, sometimes as a result of chemotherapy or illness, which hampers the body in fighting infections
microorganisms that constantly and consistently inhabit the human body. Some of these organisms are known to perform tasks that are useful for the human host, while the majority have no known beneficial or harmful effect.
organism that lives within or upon another form of life and depends on that form of life for nourishment and in some cases survival
a reproductive element of a plant or microorganism, usually in a resting state and encased in a hard, resistant protein coat