RT Journal Article SR Electronic T1 Tdap vaccination during pregnancy to reduce pertussis infection in young infants JF Canadian Family Physician JO Can Fam Physician FD The College of Family Physicians of Canada SP 497 OP 498 VO 59 IS 5 A1 Jeremy N. Matlow A1 Anna Pupco A1 Pina Bozzo A1 Gideon Koren YR 2013 UL http://www.cfp.ca/content/59/5/497.abstract AB Question What is the basis for the new recommendations to vaccinate pregnant women against pertussis after the first trimester? Answer There have been outbreaks of epidemic proportions of pertussis, mostly among young infants who have not received sufficient passive immunity from their mothers. This strategy of vaccination during pregnancy aims at stopping these life-threatening epidemics.