Toxoid

Toxoid

      A short wiki link on the subject can be found at:  http://en.wikipedia.org/wiki/Toxoid

A 1930's poster

 

 

A wiki link on diphtheria can be found at:  http://en.wikipedia.org/wiki/Diphtheria

Another link on diphtheria can be found at:  http://kidshealth.org/parent/infections/lung/diphtheria.html

There are many other links on diphtheria, also.