<prompt> Which among the following is the most common cause of early-onset sepsis in neonates?H influenzaeListeriaCoagulase positive staph aureusGroup B streptococcus  <response>: Early-onset infection 3 days is most often caused by group B beta-hemolytic streptococci GBS and gram-negative enteric pathogens most commonly E coli. Other organisms to consider are non-typeable Haemophilus influenzae, Enterococcus, Staphylococcus aureus, other streptococci and Listeria monocytogenes. Late-onset sepsis 3 days of age is caused by coagulase-negative staphylococci most common in infants with indwelling central venous lines, S aureus, GBS, Enterococcus, and gram-negative organisms, in addition to Candida species. Ref: Thilo E.H., Rosenberg A.A. 2012. Chapter 2. The Newborn Infant. In W.W. Hay, Jr., M.J. Levin, R.R. Deterding, J.J. Ross, J.M. Sondheimer Eds, CURRENT Diagnosis Treatment: Pediatrics, 21e. 