Diseases have always been a problem for living creatures and until relatively recently they were a total mystery. 

In the last 150 years we have learned so much more about diseases and their causes than in previous centuries, and that is because of advances in science. 

Smallpox is only the first human disease that we have completely eradicated, but several others are very close to being wiped out, thanks to many scientific advances such as vaccines and antitoxins. 

This highly interesting video by SciShow discusses three creative ways that we have come up with to help eradicate diseases. 

Be warned that there are a few images of disease that you might not want to see if you are squeamish. 

Let me hear your thoughts in the comments below!