Study	Reason for exclusion
Marchand 1990	Randomized study which investigated pharyngeal instillation rather than systemic prophylaxis with vancomycin, and did not report results of CoNS sepsis episodes. Reduced airway colonization rates with CoNS were demonstrated.
Ocete 1998	Comparison of sepsis rates after introducing routine low dose vancomycin prophylaxis, with rates in historical controls. Not restricted to very low birth weight infants.