How Did Louis Pasteur's Five Children Die From Typhoid Fever?

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Louis Pasteur had 3 of his 5 children die from Typhoid fever. This may have been a catalyst to his work but he also asked questions and sought answers. One specific question, `By analogy, is it unreasonable to hope that the day will come when easily administered preventive measures will be able to stop the scourges which terrify and decimate populations, such as yellow fever and the bubonic plague?' (Pasteur 1879). He questioned where yeast came from, why certain chickens died and others lived, and if weaker strains of disease could prevent one from getting sick. These questions led to discovery. Pasteur is credited with creating the vaccine for rabies, contributing to the anthrax vaccine, identifying staphylococcus, streptococcus , pasteurization,