The concept of immunity has intrigued Fx Vital Immune Defense Supplement Review  mankind for thousands of years. The prehistoric view of disease was that supernatural forces caused it, and that illness was a form of theurgic punishment for bad deeds or evil thoughts visited upon the soul by the gods or by one's enemies. Between the time of Hippocrates and the 19th century, when the foundations of the scientific methods were laid, diseases were attributed to an alteration or imbalance in one of the four humors blood, phlegm, yellow bile or black bile. Also popular during this time before learning that communicable diseases came from germs/microbes was the miasma theory, which held that diseases such as cholera or the Black Plague were caused by a miasma, a noxious form of bad air. If someone were exposed to the miasma in a swamp, in evening air, or breathing air in a sickroom or hospital ward, they could get a disease.

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