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Tuberculosis is caused by a group of or...
Kaposi's sarcoma on the foot. This onc...
Canker sores (Aphthous ulcers) are very...
This bacterial infection is caused by M...
This is a close-up of seborrheic dermat...
This is seborrheic dermatitis on the fa...
This is a skin lesion resulting from di...
These lesions are associated with the m...
Kaposi's sarcoma was once a rare malign...
Kaposi's sarcoma, seen here on the thig...
Kaposi's sarcoma usually occurs in male...
Molluscum contagiosum is most commonly ...
Herpes zoster (shingles) normally occur...
Antigens are large molecules (usually p...
AIDS (acquired immune deficiency syndro...
Many sexually-transmitted diseases (STD...
HIV (human immunodeficiency virus) is a...
HIV (human immunodeficiency virus) is m...
Because the immune system cells are de...
AIDS
Mature HIV-1 viruses (above) and the l...
The AIDS virus. (National Institutes o...
This scanning electron micrograph (SEM...