Letter to the editor: Importance of serum bactericidal activity for estimating the breadth of protection for new meningococcal vaccines Anderson, Annaliesa S and Eiden, Joseph J and Perez, John L and Balmer, Paul and York, Laura J and Jansen, Kathrin U, Eurosurveillance, 21, 30191 (2016), https://doi.org/10.2807/1560-7917.ES.2016.21.15.30191