“…[3] LOS is mainly caused by Grampositive organisms, such as CoNS, [6] S. aureus, S. pneumoniae and S. pyogenes, [3] although the proportion of LOS caused by Gram-negative organisms is rising. [25] An SA study published in 2005 reported that Gram-negative organisms (E. coli) are responsible for the majority of EOS, and Gram-positive organisms (CoNS, Enterococcus faecalis, viridans streptococci) are the major contributors to LOS (57.9%). [8] This contrasts with two more recent SA studies, which reported that LOS and healthcare-associated infections are predominantly due to Gram-negative organisms, such as Acinetobacter spp., Klebsiella spp., Enterobacter spp., and E. coli (46.1 -48.2%).…”