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TL;DR:
The problem is growing leafy plants like lettuce and spinach in space can come with a side dish of bacteria, according to a new study from a team at the University of Delaware. In tests on plants grown in simulated microgravity, they were shown to actually be more susceptible than normal to the Salmonella enterica pathogen.
Isn’t biofilm a problem in general? From what I’ve heard, Mir was covered in grime at the end and the ISS isn’t looking much better now.