[rjbemsha]

Actually, the theory of panspermia (comets, etc. carrying vital spores of frozen microorganisms to earth) suggests China would be the earthly source of some diseases. The spores would percolate from high in the atmosphere down to Earth. Naturally, they would reach the tallest peaks first, the Himalayas, and then into southeastern China following the prevailing winds.

[cloudmountain]

Actually, the theory of panspermia (comets, etc. carrying vital spores of frozen microorganisms to earth) suggests China would be the earthly source of some diseases. The spores would percolate from high in the atmosphere down to Earth. Naturally, they would reach the tallest peaks first, the Himalayas, and then into southeastern China following the prevailing winds.

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The disease mentioned was from filth: bubonic plague, from the infected fleas on the infected rats, from lack of cleanliness.

Rats don't HAVE to be dirty or infected but they were in China. Cleanliness costs and such...