Unsanitary conditions and chemical poisoning is still a thing. However so called pathogenic viruses/bacteria is unscientific scam which has never been properly proven.

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Not just never proven, but many attempts to prove it seem to furnish contrary evidence. For example, volunteers spent time with "Spanish Flu" patients (supposedly one of the most contagious diseases of all time) and did not take sick.

Whats wrong with unsanitary conditions?