Why Do Germs Really Cause Illness?

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Louis Pasteur was a scientist who was born in France in 1822. Some scientists had discovered that germs actually cause many illnesses, but most people didn’t believe this idea. Pasteur proved that germs can cause milk to sour or juice to become wine. He proved that germs can make people sick too Hundreds of years ago, people knew little about diseases or why they got sick. Sometimes people thought sickness was caused by evil spirits or spells. Illness might occur when the planets lined up or if a person had sinned. People believed bad blood might also cause illness. Doctors used a lot of odd remedies. Sometimes they put leeches on a patient’s body. The leeches sucked out the bad blood. At other times, a doctor might cut open the skull to let

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