When I worked on a trip with a mission in New Orleans our biggest fear was mold like this. On this mission trip we tried to help our homeowners post-Katrina to "muck" their houses and this meant stripping it down to its foundation and wood walls to get rid of much of the mold that had developed on other parts of the house.
We wore masks and things over our mouths at all times, and no one ever became sick, which was nice.
The saddest part of the trip was meeting the homeowners who had been in their houses for decades, who in some instances would have to rebuild because the damage was too expansive and there were those whose memories like photo albums were ruined.
The other crazy thing was that the trip took place a year and a half after Katrina - which really reminded everyone on our trip of how much damage New Orleans incurred because of the Katrina.