Necrotising enterocolitis (NEC) is estimated to be the most prevalent emergency of the gastrointestinal tract in the neonates (1). The overall incidence of NEC is approximately 1 in 1000 live births, but in infants less than 1500 g, the incidence increases to between 3% and 10% (2). The pathogenesis of NEC is likely to be multifactorial with an important microbial component to it. The intestinal microbiota of preterm infants is less diverse than that of term infants and appears to be more commonly colonized by potential pathogenic species from genera such as Klebsiella, Enterobacter and Clostridium (3, 4).