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.
Biodiversity hypothesis of health
We are exposed to microbes via different ways from which the most important are respiratory tract, digestive system and skin contact. The habitat we live in and the food we eat influence greatly to our microbiota. Our own way of living and our choices — how we live, eat, move and what are our recreational activities — impacts on the amount of valuable microbe exposure. The amount as well as the microbial diversity of exposure are essential factors.