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HIV can never be diagnosed based on clinical symptoms. Moreover, symptoms of HIV include a generalized lymphadenopathy, weight loss of more than 10 % in short duration, long term diarrhea more than one month, etc. You have done CMIA test after 70 days that detect both antigen and antibody. It gives conclusive result after six weeks. So you may need not worry. However, the guideline says that you should repeat your HIV test after three months of exposure and that too after 85 to 90 days of exposure.