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Fecal oral is how norovirus spreads on cruise ships with nearly everyone getting a case of it. It is also one of the prime suspects of how the Diamond Princess had so many so quickly. Fecal oral is how day care centers get Norovirus and have to shut down all the time. When people have diarrhea they emit a plume of micron sized fecal matter into the air that can travel tens of meters think public bathrooms. Fun fact the smell of feces is not gaseous what the human nose registrars as fecal smell is actually the micron sized solid fecal particles emitted when people defecate think about that tasty tidbit the next time one is in a public bathroom and smells poo from the next stall that’s actually solid particles and if they have a fecal loaded with virus those particles are more than enough to cause infection. Ebola is transmitted this way that’s been confirmed in the last Ebola outbreak. It’s all about minimum viral load to initiate infection Ebola is something like 50 virons. It is unknown what the minimum load for Covid19 is but other coronavirus like sars or mers are similar to Ebola 50 to 100 virons a good inhale of a fecal plume has thousands of particles with tens of virons each food for thought.