Pertussis vaccine in pregnancy—first dose for every infant?

The article discusses the research paper "Effectiveness of Maternal Pertussis Vaccination in England: An Observational Study." It references a study by Gayatri Amirthalingam et al., published in the September 2012 issue of "The Lancet." It offers information on the estimated effectiveness of the vaccine among infants several days before birth, questions to be considered in giving pertussis vaccine to pregnant women, and findings on infant immune responses.