TF mas muaj nyob hauv ntshav ntshav, cov ntsiab lus nruab nrab yog kwv yees li 1.20 ~ 3.25g / l. Hauv cov neeg noj qab nyob zoo, yuav luag tsis muaj. Thaum zom cov ntshav tawm, TF hauv cov ntshav ntshav ntws mus rau hauv lub plab zom mov thiab tawm nrog cov mob ntshav qab zib. Yog li ntawd, fecal TF ua kom tsim nyog ua ib qho tsim nyog thiab tseem ceeb rau kev pom ntawm kev los ntshav. Cov khoom siv yog qhov yooj yim, kuaj pom kev pom tseeb uas kuaj tau TF rau tib neeg cov tshuaj qab, nws muaj cov siab tau txais kev paub thiab muaj zog tshwj xeeb. Qhov kev xeem raws li cov tshuaj tiv thaiv sandwich thiab kub immunomatogromogratogromogratogromogromographic thev naus laus zis, nws tuaj yeem muab rau hauv 15 feeb.