Uploaded August 2026 | Updated September 2026, 2 weeks ago

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There's all sorts of microorganisms on the subway, metro, underground, or whatever you call it. But how many of them are pathogenic?

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Sources: docs.google.com/document/u/1/d/e/2PACX-1vTAHWk3oJPPAurK3uW8AieVp9zVoKfYCunLvv2DqHZjqkReh6GgTSI_JuA4yArnAdrl7Yz2kXXluXQs/pub