Infectious fungi in bathroom drains

Fusarium spp. growing on fruit - Photo: N. Carlson

NPR news reports that Fusarium spp. found in bathroom drains has been linked to sinus and toenail infections.  It is also allergenic and is in rare occasions fatal to people with compromised immune systems.

Fusarium spp. - microscopic photo N. Carlson

In my experience Aureobasidium spp. is more commonly found in bathrooms on the caulk and in the corner of a shower.  It is allergenic and associated with a malady known as sauna takers lung.  The fungi is black and slimy in texture when wet.  

Aureobasidium spp. photo - N. Carlson