Microbiology
Microbiology (from Greek , "mīkros", "small"; , "bios", "life"; and , "-logia") is the study of microorganisms, those being unicellular (single cell), multicellular (cell colony), or acellular (lacking cells). Microbiology encompasses numerous sub-disciplines including virology, parasitology, mycology and bacteriology.
Microbiomes of the built environment
This field encompasses studies of any kind of microorganism (e.g. bacteria, archaea, viruses, various microbial eukaryotes including yeasts, and others sometimes generally referred to as protists) and studies of any kind of built environment such as buildings, vehicles, and water systems.