Chapter 19, Problem 21Q

Summary Introduction

To explain:

Each and every term of influenza surveillance graph and also explain the meaning of black and red lines.

Introduction:

Pneumonia is an infection in which air spaces of lungs are damaged. It can be caused by viruses, bacteria and fungi. In case of pneumonia, air sacs of lungs are filled with fluid or pus. Influenza, commonly known as flu, is a respiratory illness caused by a virus. Symptoms can be mild to severe.