AIDS (Acquired Immuno Deficiency Syndrome) § Syndrome means a group of symptoms. § AIDS is the deficiency of immune system. § Caused by HIV (Human Immunodeficiency Virus), a retrovirus having RNA genome. § AIDS was first reported in America (1981).
CANCER · Cancer is an abnormal and uncontrolled multiplication of cells resulting in the formation of tumor. · Normal cells show a contact inhibition (contact with the other cells inhibits their uncontrolled growth). Cancer cells appear to have lost this property. · Cancer cells form masses of cells called tumors.