Are there specific blood tests to identify viruses? Cbc clear but been ill for 2 months. Abdo/low back pain, sore throat, mild fever, inflamed joints

Blood Tests. A viral culture might be drawn to identify a virus in your blood, but many viruses hide within cells, such as the HIV virus. Bacteria are usually more easily identified, but only if the bacteria is actually in the blood. Better identifying factors might be your eosinophils, neutrophils, and your total WBC blood count, but these only show that your body if fighting a problem. See your doctor!