Major signs included by WHO for AIDS diagnosis -
The initial evaluation of a patient with HIV infection and diarrhea should include a set of stool examinations, including culture, examination for ova and parasites, and examination for Clostridium difficile toxin.In patients for whom this diagnostic evaluation is nonrevealing, a presumptive diagnosis of HIV enteropathy can be made if the diarrhea has persisted for >1 month. (Harrison's Principles of internal medicine, 20th edition, page 1511 )
Chronic diarrhea > 1 month
Chronic cough > 1 month
Chronic fever > 1
Weight loss of at least 10% of body weight
Infection