Genetic characterisation of the emerging invasive Neisseria meningitidis serogroup Y in Sweden, 2000 to 2010 Thulin Hedberg, S and Törös, B and Fredlund, H and Olcén, P and Mölling, P, Eurosurveillance, 16, 19885 (2011), https://doi.org/10.2807/ese.16.23.19885-en