Humanity didn't always know about the invisible viruses, bacteria, and microbes that can cause disease. But that doesn't mean we didn't come up with some truly bizarre ideas. From the four humors and miasma theory to bloodletting and...

We travel to Poona in India where the very latest rubella vaccines are under development and we find out about the new methods of delivery and production. We filmed in the Dominican Republic in Central America where CRS is a major cause...