We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleDelayed immunisation and risk of pertussis in infants: unmatched case-control studyAuthorsGrant, C. CPublicationBMJ, 2003, Vol 326, Issue 7394, p852ISSN0959-8138Publication typearticleDOI10.1136/bmj.326.7394.852