CAT and Guillain-Barre syndrome: GBS is an encapsulated β-hemolytic, catalase-negative, gram-positive cocci in pairs and/or chains bacteria.2The bacterial polysaccharide capsule has 10 serotypes (Ia, Ib, II, III, IV, V, VI, VII, VIII, IX).6In North America, serotypes Ia, Ib, II, III, and V are frequently accounted for neonatal GBS infection (98%), with serotype III being the most common cause of neonatal LO GBS and meningitis.2, 6We did not have GBS serotyping in our case, as it was not a routine practice in our institution's laboratory.