Paul Ehrlich:

A German physician and scientist
He was one of Koch's students
Well known for Salvarsan 606, which was developed in 1910
This was the first effective treatment for syphilis which was a sexually transmitted disease
This was the first drug nicknamed a 'magic bullet'
This term illustrates a drug that is designed to specifically target a certain germ causing the illness, while not really effecting the body in any other way

Impact of germ theory:

Changed medical knowledge regarding causes and treatments of diseases
Furthered the value of science in establishing links between bacteria and disease