TY - JOUR AU - Chang, Qiuzhi AU - Stevenson, Abbie E. AU - Croucher, Nicholas J. AU - Lee, Grace M. AU - Pelton, Stephen I. AU - Lipsitch, Marc AU - Finkelstein, Jonathan A. AU - Hanage, William P. PY - 2015 DA - 2015/02/18 TI - Stability of the pneumococcal population structure in Massachusetts as PCV13 was introduced JO - BMC Infectious Diseases SP - 68 VL - 15 IS - 1 AB - The success of 7-valent pneumococcal conjugate vaccination (PCV-7) introduced to the US childhood immunization schedule in 2000 was partially offset by increases in invasive pneumococcal disease (IPD) and pneumococcal carriage due to non-vaccine serotypes, in particular 19A, in the years that followed. A 13-valent conjugate vaccine (PCV-13) was introduced in 2010. As part of an ongoing study of the response of the Massachusetts pneumococcal population to conjugate vaccination, we report the findings from the samples collected in 2011, as PCV-13 was introduced. SN - 1471-2334 UR - https://doi.org/10.1186/s12879-015-0797-z DO - 10.1186/s12879-015-0797-z ID - Chang2015 ER -