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Serotype and Clonal Evolution of Penicillin-Nonsusceptible Invasive Streptococcus pneumoniae in the 7-Valent Pneumococcal Conjugate Vaccine Era in Italy |
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| Authors: | Giovanni Gherardi Fabio D'Ambrosio Daniela Visaggio Giordano Dicuonzo Maria Del Grosso Annalisa Pantosti |
| Affiliation: | Centro Integrato di Ricerche, Laboratory of Microbiology, Università Campus Biomedico, Rome, Italy, and Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Rome, Italy |
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