Spread of disease is unavoidable in a society of public restrooms and shared infrastructure. Sick people contaminate their environment at points of contact like

Spread of disease is unavoidable in a society of public restrooms and shared infrastructure. Sick people contaminate their environment at points of contact like handles, toilet seats, keyboards, the air around them, etc. The damages caused by sick people at work are poorly estimated at $150B (https://www.businessnewsdaily.com/11323-cost-of-coming-to-work-sick.html https://www.businessnewsdaily.com/11323-cost-of-coming-to-wo...). I could imagine micro terrorists or psychos who actively try to spread disease. Sick people who go to work do the same thing, just without evil intentions. It would be relatively easy to cultivate bacteria or viruses and spread them across the human environment. Examples: - Go to the airport and mist some Norovirus around - Enter a couple stalls and drip some E-Coli on the seats or contaminate a whole role of toilet paper or drying paper - Contaminate a few ketchup bottles at a restaurant or mist the silverware bucket It would be extremely difficult to pinpoint these people as the damage is anonymous, random, and highly distributed. Damages could dwarf any previous terrorist attack or serial killer. It's likely that such people exist.