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A biological therapy used to treat a disease by activating or suppressing the immune system.


A common and highly contagious bacterial skin infection that appears as red sores and is most common among infants and children.


The inability to control urination or bowel movements.

Intracytoplasmic sperm injection (ICSI)

A procedure (done in conjunction with in vitro fertilization) in which a single, healthy sperm is extracted from a semen sample and directly injected into the cytoplasm of a mature egg.

Intrauterine device (IUD)

A small device inserted into the uterus to prevent pregnancy.

Intrauterine insemination (IUI)

A type of artificial insemination in which sperm that have been washed and concentrated are directly placed in the uterus during ovulation.

In vitro fertilization (IVF)

A complex series of procedures in which mature eggs are collected from the ovaries, fertilized by sperm in a lab and then implanted back into the uterus as an embryo.

Irritable male syndrome

A state of hypersensitivity, frustration, anxiety, anger and lethargy that occurs in men when testosterone levels fall naturally or due to external stress.


A class of phytoestrogens, which are plant-derived compounds that are similar to the female hormone estrogen.