My dh's da was sorting some donations last spring and they were moldy. She got an aspergillis (fungus) infection of the sinus and lungs and it took a long time to dx. Her situation is complicated, though. She had thyroid cancer in her 20s, and the radiation affected her heart, and she now has pericarditis, I think.
I hope your brother will be dx'd and treated quickly and recover fully.
Keiki's Makuahine (Keiki's Mom) 51, dh 52
Keiki: b. 2002 after 3 months bedrest
Natural conception following ZIFT/chem. pg
Olivia: b. 1999 d. 1999
28-week preemie, ptl cause unknown
Natural conception after 1 mc
ttc since 1998