Image:Bacteria in FISH principle: based on the tested bacteria 16 s rRNA sequence design of different fluorescent probe hybridization reaction with bacteria. FISH identification features: to locate and identify different bacterial flora distribution, quantity proportion, etc. Can't accurate quantitative, accurate quantitative rt-pcr again, but the flora imbalance and flora test specimen is widespread, the distribution of soil, water, insects, and plant roots, with oral flora in the medicine, the gut, inflammation, parts, etc. Why use 16 s rRNA: bacterial FISH principle: based on the tested bacterial flora of 16 s rRNA sequence design of different fluorescent probe hybridization reaction with bacteria.