Transmission electrom micrograph of a culture of Human Immunodeficiency Virus type 1 (HIV-1). The sample used here is strain IIIB, the laboratory standard culture strain. HIV is the causative agent of AIDS, a viral disease characterised by the loss of the body's cell-mediated immune response. The virus may be transferred between people through infected blood, semen or vaginal fluid. After a long incubation period the patient may first develop fevers, weight loss and enlargement of the lymph nodes. Patients will normally die from infections such as pneumonia or from cancers such as Karposi's syndrome. Magnification x108,000 at 8x10 inch size.
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