1981: AIDS diagnosed. A new fatal, infectious disease was diagnosed in 1981. Called Acquired Immunodeficiency Syndrome (AIDS), it began appearing in major cities among homosexual men and intravenous drug users. Other high-risk groups were haemophiliacs and other recipients of blood or blood products, babies born of AIDS-infected women, bisexual men, and prostitutes and their customers. [...]

Sexual precautions. Naturally, the most certain way to avoid an STD is to avoid sexual contact with infected persons. One sure way to do that is by sexual abstinence, meaning not having sex with anyone. Sexual abstinence in young adults is a normal and healthy choice. The next most certain way of avoiding an STD [...]

Other Growth Changes Some alterations in tissue growth are not cancerous. Atrophy, for example, is a lessening in size. It is the shrinking of cells or tissues for various reasons. Starvation, for instance, causes atrophy of the adipose, or fatty, tissues. Disuse of a body part may also lead to atrophy. When a fractured arm [...]

Other Metabolic Diseases Gout is faulty metabolism of purine, an amino acid, resulting in the accumulation of uric acid in the blood and urate salts in the tissues, especially the joints where they cause painful arthritis. It may stem from an inborn error of metabolism or from other diseases. It usually strikes middle-aged men. The [...]

Bed bug An organism that lives on or within another organism, called the host, and that gains its sustenance from the host organism is known as a parasite. Parasites occur among all the major groups of living things. There are parasitic fishes for example, the lamprey, which attaches itself to other fishes and sucks their [...]

 Human beings are born sexual. Humans develop a strong sense of being male or female. This sense of maleness or femaleness and the behaviour exhibited because of it is called human sexuality. The characteristics of being a man or a woman involve biological, psychological, and sociological behaviours as well as the reproductive capacity and sexual [...]

The disease known as AIDS is a complicated illness that may involve several phases. It is caused by a virus that can be passed from person to person. AIDS impairs the human body’s immune system the system responsible for warding off disease and leaves the victim susceptible to various infections. AIDS was first conclusively identified [...]