Having worked with infectious agents for the last 27 years, I can tell you that the contact time required to kill some of the more resistant organisms is considerable. Lysol is not the best chemical agent out there, it is only a disinfecting agent not a sterilent and even at that requires a long contact time. As Beachdoc has stated in his last post, LabSafety as well as a few other laboratory supply companies sell very effective respiratory protective devices. For surface decontamination, the cheapest and most widely available chemical disinfectant remains to be unscented household bleach. We use it extensively in the lab at a 10% concentration, but even a 5% solution is highly effective in decontaminating clean surfaces. Pete