Chapter 17, Problem 3Q

Summary Introduction

To explain:

Polio virus has become less virulent in the evolutionary time scale whereas rabies virus has retained the virulence potential.

Introduction:

Polio virus belongs to family Picornaviridae, genus Enterovirus. There is membrane surface proteins present which provides protection against chemical treatment and harsh environmental conditions. Rabies is caused by a rabies virus which is present in the saliva of animals like a dog.