1. Microbiology Laboratory, Complexo Hospitalario Universitario de Vigo, Vigo, Spain.
2. Group of Microbiology and Infectology, Fundación Biomédica Galicia Sur, Vigo, Spain.
3. Reference and Research Laboratory for Vaccine Preventable Bacterial Diseases, Instituto de Salud Carlos III, Madrid, Spain.
4. Methodology and Statistics Unit, Fundación Biomédica Galicia Sur, Vigo, Spain.