Ah man. Back in my university days, I worked in an infectious disease (HIV) lab that shared space with some GI docs. Went down to Mexico and came back with enteropathogenic e. coli. While they were super happy to get some fun samples and blood works, I've never felt sicker in my life.

My side would immortalize b-cells with Epstein-Barr... but that experience left me with a healthy respect for e coli.