Other sources besides corrigated might be wooden pallets ( or anything
wooden), Excessive moisture in the area. Do your floor drains really drain?
What about your cleaning procedures for the facility. Do they include a
disinfection step. You might also check your materials of construction.
These are source of mold I have seen in API facilities that have had mold
The PMFList (http://microbiol.org/pmf.htm) is operated from
The Microbiology Network (http://microbiol.org) and supported by
our sponsors (http://microbiol.org/sponsor.htm) as a service to
the scientific community.