Vaccines: A Molecular View
Learning Objectives
About Vaccine
How do Vaccines Work?
Types of Vaccines
Herd Immunity
The Annual inFLUenza Vaccine
About Influenza Virus
The Main Influenza Antigens
Types of Influenza Virus
Why Do the HA Numbers Matter?
What is in the Flu Vaccine?
Summary

About Vaccine
What is it?
Preparations of pathogen or parts of them
Induces immune system to respond to it (as if it is the real pathogen) and generate memory T- and B-cells
What does it do?
Prepares the immune system to recognize and destroy a pathogen when exposed to it.
Why is it important?
Vaccines protect individuals (and communities) from a large number of infectious pathogens by enabling them to rapidly mount a protective immune response upon encounter.