Our study does not include antigenic and genetic data of circulating strains so we cannot comment on suboptimal antigenic match between the 2011–2012 vaccine and circulating strains in Valencia. Further studies should be conducted over several influenza seasons to assess the variability of Bioactive Compound Library order comparative vaccine effectiveness with the degree of antigenic match between vaccine and circulating viruses. We are grateful to Julián Librero for

his comments on the various drafts of the manuscript, Isabel Muñoz and Manuel Escolano for their continuous support to the research team during the conduct of this study, the Microbiological Surveillance Network in the Valencia Autonomous Community (redMIVA) for their assistance and for sharing their data and to all the members of the Valencia Hospital Network for the Study of Influenza and Respiratory Virus Diseases. Conflict of interest: JPB, ANS, SMU and JDD work in FISABIO’s Vaccines Research Area, FISABIO has received funding for GSK, Novartis, Pfizer, SanofiPasteur, SanofiPasteur MSD for conducting epidemiological studies on infectious disease epidemiology, vaccine effectiveness, pharmacoeconomics, and safety studies. The Vaccines Research Area is and has been involved in various randomized clinical trials

with CT99021 research buy GSK, Novartis, Pfizer and MSD vaccines. No conflicts related to

the submitted paper are declared by the rest of the authors. Funding: This work was supported by a grant from the Spanish Ministry of Health to support independent clinical research, Order SPI/2885/2011, October 20, 2011 [grant number EC11-480]. “
“Neonatal vitamin A supplementation (NVAS) is currently under investigation as a public health intervention to combat vitamin A deficiency and mortality in areas afflicted by vitamin A deficiency. We have studied the effect of NVAS on infant mortality in three randomized trials in Guinea-Bissau. One trial randomized normal birth weight neonates (≥2500 g) 1:1 to 50,000 IU vitamin A or placebo (VITA I, 2002–2004) [1]. A second trial randomized low birth weight neonates Parvulin (<2500 g) 1:1 to 25,000 IU vitamin A or placebo (VITA II, 2005–2008) [2]. A third trial randomized normal birth weight neonates 1:1:1 to 50,000 IU vitamin A, 25,000 IU vitamin A or placebo (VITA III, 2004–2007) [3]. We observed that NVAS interacted with subsequent routine vaccinations in a sex-differential manner; the effect of NVAS tended to be negative in females once they started receiving the diphtheria–tetanus–pertussis vaccine (DTP) recommended at 6 weeks of age [2] and [4]. From 2003 to 2007 a trial randomizing children to early measles vaccine (MV) at 4.