Positive urinary bilirubin is not AIDS. The formation of urinary urobilinogen is such that conjugated bilirubin enters the intestine and is converted to urobilinogen, most of the urobilinogen is reabsorbed from the intestine, converted to conjugated bilirubin by the liver and then excreted into the intestinal cavity, and a small percentage of urobilinogen is eliminated from the glomerulus or renal tubules and is called urinary urobilinogen and is normal negative or weakly negative. Positivity is seen in hepatocellular jaundice, hemolytic jaundice and intestinal obstruction. AIDS is an infectious disease caused by HIV, also called acquired immunodeficiency syndrome, characterized by various opportunistic infections due to immunodeficiency, such as tuberculosis, pulmonary infections, infections of the central nervous system, herpes zoster, and pulmonary Pneumocystis carinii. There are no symptoms in the early stages of AIDS and the incubation period is long. It usually takes more than a decade from the time of HIV infection to the appearance of visible symptoms.