Cov khoom siv no yog siv los txheeb xyuas cov pab pawg B streptococcus nucleic acid DNA hauv vitro rectal swabs, qhov chaw mos swabs lossis qhov quav / qhov chaw mos sib xyaw ntawm cov poj niam cev xeeb tub uas muaj teeb meem nyob ib puag ncig 35 ~ 37 lub lis piam ntawm cev xeeb tub, thiab lwm lub lis piam gestational nrog cov tsos mob xws li raws li kev tawg ntxov ntxov ntawm daim nyias nyias, hem ua haujlwm ua ntej, thiab lwm yam.