Chapter 24, Problem 1A

Summary Introduction

To write:

Differentiation of S.pyogenes infection causing strep throat and scarlet fever.

Given:

Streptococcus pyogenes causes strep throat and scarlet fever in some patients. Differentiate S.pyrogenes infection causing strep throat and scarlet fever.

Introduction:

Streptococcus pyogenes causes strep throat and then scarlet fever. To differentiate these two infections, one should identify the presence of a toxin in scarlet fever and the absence in strep throat. So it is clear that S. pyogenes producing erythrogenic toxin causes scarlet infection.