If we set aside the fact that a disease that's 100% fatal and 100% contagious and kills its victims within 48 hours of infection would kill itself off before killing a significant number of the population, nobody at all acts with any sense due to an airborne virus.
This show would have us believe that Babylon 5's air circulation system doesn't filter viruses and pathogens from the air. Dr. Franklin makes it perfectly clear, on multiple occasions, that because Babylon 5's air is recycled, that everyone is being exposed to the virus and no Markab is safe. If the virus jumps species, then nobody is safe. Why was Babylon 5 not built with air filtration systems? We can remove viruses from the air with UV light and HEPA filters TODAY.
If I was Sheridan, I'd be getting the maintenance crew to duct tape HEPA filters to the air intake and outtakes and setting up UV lights in all the ducts. I would hate to be on Babylon 5 during cold/flu season since apparently they believe in just infecting everybody with everyone else's germs.
What was the point of this episode? Was it another heavy-handed "people who put their religious beliefs above science are going to have a bad time" episode? We already saw that in season 1.