Chapter 11, Problem 18Q

Summary Introduction

To deduce:

The circumstances that make lower virulence of no advantage to a pathogen.

Concept introduction:

There are certain circumstances when the first exposure of microbes is quite virulent; however, with the passage of time with the new host, it causes a milder form of the disease. There are various pathogens which spread their infections to humans. Zoonosis is a type of infection which is indigenous to animals but it is naturally transmissible to humans also.