<prompt> A 1-week-old neonate presents to the pediatric emergency room with fever, irritability, poor feeding, and a bulging anterior fontanelle. Lumbar puncture is performed, and the cerebrospinal fluid CSF grows group B Streptococcus. Which of the following is the most likely pathogenic mechanism?Complement C5a, a potent chemoattractant, activates polymorphonuclear neutrophils PMNsIn the absence of a specific antibody, opsonization, phagocyte recognition, and killing do not proceed normallyThe alternative complement pathway is activatedThe streptococci are resistant to penicillin  <response>: There has been speculation concerning the pathogenesis of GBS. This includes failure to activate complement pathways and immobilization of polymorphonuclear leukocytes due to the inactivation of complement C5a, a potent chemoattractant. 