Influenza: This disease is caused by the influenza virus, not bacteria. You may develop secondary bacterial infections in association with influenza, usually after the 4th day of illness. Blood in sputum (if it is sputum and not just saliva) deserves a visit to a doctor and probably some lab tests and imaging studies. Go now, do not wait to see if you are getting better. Good luck.
Answered 3/8/2014
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