Invasive Streptococcus pneumoniae infections in children and older adults in the north of Spain before and after the introduction of the heptavalent pneumococcal conjugate vaccine

1. Pérez-Trallero, E.
2. Marimon, J.M.
3. Ercibengoa, M.
4. Vicente, D.
5. Pérez-Yarza, E.G.