Horse. German. Jew. And a Parsi Stud Farm.

Every second child in 19th century Germany was infected with diphtheria. It was the most frequent cause for deaths in children under 15 years. Emil Von Behring, a German scientist observed that guinea pigs which were immunized with the diphtheria bacterium never got the disease again. But he needed a larger animal that could produce higher quantities of serum.

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