Newborns are tested for group B streptococcus infection, which is usually determined by DNA testing of blood or pharyngeal swabs, or blood culture, combined with routine blood tests. 1. Blood or throat swabs for DNA testing, through the newborn’s blood or throat swabs for collection, detection of specimens of group B streptococcus DNA, can be diagnosed; can also be detected by blood culture of group B streptococcus, and can be carried out drug sensitivity testing. 2. Blood routine. When a newborn is infected with group B streptococcus, it may cause elevated white blood cells and C-reactive protein in the blood routine. When a newborn is diagnosed with group B streptococcus infection, it should be treated aggressively under the guidance of the doctor in conjunction with the test results.