I guess if we don’t eat poop or have anal sex, all is good:
“Shigella is very contagious. People get infected with shigella when they come in contact with and swallow small amounts of bacteria from the stool of a person who is infected with shigella. For example, this can happen in a child care setting when staff members don’t wash their hands well enough after changing diapers or helping toddlers with toilet training. Shigella bacteria can also be passed in infected food or by drinking or swimming in unsafe water”.
And even though it is non spore forming it can hang out on surfaces for over a month.
And what about all those unclean hands picking and processing produce? That is a worrisome vector.