Streptococcus agalactiae is a Gram-positive, catalase-negative, beta-hemolytic bacterium classified within Lancefield Group B that exhibits distinct biochemical phenotypes: bacitracin resistance, pyridine nucleotide reduction negativity (PYR negative), and hippurate hydrolysis positivity. This organism occupies the domain of clinical microbiology as an obligate colonizer of the female genital tract, differentiating itself from Streptococcus pyogenes primarily through these specific enzymatic tests rather than morphological characteristics alone. Theoretical significance lies in its pathogenesis via neonatal transmission during delivery, where infection by this facultative anaerobe manifests specifically as pneumonia, meningitis, or sepsis in newborns due to vertical transfer from the maternal vaginal flora.
Streptococcus agalactiae is a Gram-positive, catalase-negative, beta-hemolytic bacterium classified within Lancefield Group B that exhibits distinct biochemical phenotypes: bacitracin resistance, pyr…