If you are concerned about a specific exposure, see your doc and get tested. For many infections there are specific symptoms: fever, sweats, chills, weight loss, cough, chest pain, vomiting, diarrhea, urinary discomfort/back pain, discharge, skin lesions w/pus. For these you need to see a doc for treatment. For hiv, hepatitis, hpv specific tests need to be done.
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