Sukumaran et al. JAMA
Pertussis is poorly controlled, with the highest rates of morbidity and mortality among infants. Although the source of infant pertussis is often unknown, when identified, mothers have historically been the most common reservoir of transmission. Despite high vaccination coverage, disease incidence has been increasing. The authors examined whether infant source of infection (SOI) has changed in the United States in light of the changing epidemiology.
Abstract with link to Full paper.