The focus of the study was on the MMR (measles, mumps, rubella) vaccine, and because no chicken pox (varicella) vaccine is given in the Netherlands, they used varicella as a control comparison. They took blood samples to analyze antibody levels of measles, mumps, rubella, and varicella - See more at: http://healthimpactnews.com/2013/vaccines-reduce-newborns-disease-immunity-study/#sthash.OemgWqbd.dpuf