[tgsovlerkhgsel]

I believe the research on the bat viruses was being done under BSL-2 conditions, which basically means normal lab practices, an autoclave for waste, and some of the work needs to be done in a biosafety cabinet. Of course, that assumes the procedures are strictly followed.

[echelon]

BSL-2 biosafety cabinets only have laminar flow hoods. They're effectively open air and depend upon proper protocols being followed.

Typically you're more concerned about what's getting into your BSL-2 hood than out.