Question

Doctor who discovered that without washing hands can be a potential source of diseases

Answer 1

Ignaz Semmelweis discovered the importance of hand washing in 1858, opening the era of infection control.
Ignaz Semmelweis was a austrian Hungarian physician not a doctor. Ignaz Semmelweis was employed as assistant to the professor of the maternity clinic at the Vienna General Hospital in Austria in 1847, Semmelweis introduced hand washing with chlorinated lime solutions.
When louis pasteur developed the germ theory of disease, offering a theoretical explanation of Semmelweis findings. He is considered a pioneer of antiseptic procedures.