EBK BIOLOGY
EBK BIOLOGY
6th Edition
ISBN: 8220106777640
Author: Maier
Publisher: PEARSON
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Chapter 21, Problem 3AAATB
Summary Introduction

To determine:

The reason for the requirement of flu shot every year but there is a requirement of only a single inoculation against some other diseases.

Introduction:

The immune system can be defined as the organs and body processes that resist the infection and toxins. Flu or influenza is a respiratory disease that is caused by a virus. It is extremely contagious and is usually spread by the sneezes and coughs of an infected person.

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