Chapter 12, Problem 6WIO

Summary Introduction

To explain:

The evolutionary perspective of eradication of smallpox by the vaccine; whereas, scientists still need to produce a new influenza vaccine every year.

Introduction:

Influenza and smallpox both the diseases are caused by a different virus. Smallpox is a contagious and deadly disease that has affected the human population for thousands of years. Influenza is commonly known as ‘flu.’ It is also highly contagious respiratory illness. The symptoms of flu can be mild to severe.