What is pneumonia? When air sacs in your lungs fill with fluid, as the result of an infection, you have pneumonia. Usually a complication of the flu, severe cases can be life-threatening.
Unfortunately, some people think that getting a flu vaccine is too much trouble or costs too much. Or they are sure that a flu shot will make them sick or make them more likely to catch the flu.
What is strep throat? About a third of children with a sore throat have a strep infection. Rare in children younger than three, strep usually occurs between the ages of five and 15.