How do I know if I have pneumonia? Had the flu 3 weeks ago, got better, now feels like a cold with cough w/phlem, 98.0, chills. Shingles vac last week.

Watch closely. In many cases, a person getting over the flu, develop a what is called a secondary pneumonia. This occurs when the respiratory lining, damaged by the initial viral onslaught, is now vulnerable to bacterial attack. Your situation is not uncommon- you are at risk for a pneumonia so if your symptoms worsen, see your doctor for an evaluation.