Answer and Explanation:
Pneumonia is the inflammation of the lungs, usually caused by an infection. It affects the respiratory system (lungs and throat) and causes minor injuries, which are the gateway to the pneumococcus. As a person's resistance is lower (which are in elderly people), the bacteria can multiply and end up causing an infection in the lungs.
The main symptoms are: cough with phlegm; high fever; shortness of breath; chest pain; accelerated breathing and feeling of weakness. Older patients may not have a fever, but may have mental confusion.
The therapeutic value of a medication is called its efficacy.
