I was wondering if anybody had studied or was knowledgeable about the pink growth that people often find around water fixtures in their homes, especially bath tubs and showers?
My understanding is that this pink growth is actually a bacteria and not a fungus as many assume (source1,source2). Supposedly, the bacteria, Serratia marcescens is airborne and thrives in areas of retained moisture and fatty residue.
My main questions are:
- How ubiquitous is this bacteria? What is the bacteria's geographical range of occurrence?
- For example, is this species more prevalent in more humid environments?
- Are there other species of Serratia that can create similar pink biofilms in tubs? (Are the sources of "pink" separated by geographic location?)
- Is S. marcescens even forming a biofilm in these pink stains??
- What likely introduces S. marcescens into a bathroom?
I ask, because I've seen this bacteria both present or absent from similarly clean or dirty bathrooms, and thus far have not really seen any consistent patterns in the bacteria's spatial occurrence.
Any other interesting facts or sources on S. marcescens would be great!