What is the flu? The flu is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times, can lead to death.
What is Pneumococcal Disease? Pneumococcal disease is an infection caused by a type of bacteria called streptococcus pneumoniae. When these bacteria invade the lungs, they can cause pneumonia.
Here are CDC's current information on pneumococcal disease.