MEASLES RISK: The Palisadian-Post analyzed measles (MMR) immunization rates at elementary schools in the Palisades. Public health officials say 90% immunization is required to achieve “herd immunity." Five elementary schools in the Palisades fall below that rate including one school where only one in five children have the MMR vaccination. Which five schools? Find out in the Feb. 5 issue of the Post - on sale tomorrow.