Changes in Pneumococcal Serotypes and Antibiotypes Carried by Vaccinated and Unvaccinated Day-Care Centre Attendees in Portugal, a Country with Widespread Use of the Seven-Valent Pneumococcal Conjugate Vaccine
                        AuthID
P-003-EHE
                
    P-003-EHE
 
    
                     
    
                     
    
                     
                    