Robert Koch

German physician, bacteriologist (1843–1910)

four criteria showing a causal relationship between a causative microbe and a disease

Tuberculin, known in its modern form as purified protein derivative (PPD), is a combination of proteins that are used in the diagnosis of tuberculosis by injection into the skin. Common side effects include redness, itchiness (pruritus), and pain at the site of injection. Allergic reactions may occasionally occur. Use is safe in pregnancy.

German government agency responsible for disease control and prevention

award

1939 film by Hans Steinhoff