BOSTON (CBS) – Researchers at Duke Health have developed a blood test that can identify whether a sick patient has a bacterial or viral infection, and as Dr. Mallika Marshall reports, that could help doctors determine the appropriate treatment. Scientists at Duke Health have come up with a blood test that can distinguish whether a respiratory infection is bacterial or viral. Dr. Ephraim Tsalik, Lead Author and Assistant Professor of Medicine at Duke, says, “Bacterial infections are ones that typically are treated with antibiotics whereas viral infections like the common cold are typically treated supportively with bed rest, fluids, Tylenol.” Dr. Tsalik and his team developed what they call gene signatures or patterns that show which genes are turned on and off when a person is fi...