TY - JOUR AU - Pelton, S I; Huot, H; Finkelstein, J A TI - Emergence of 19A as virulent and multidrug resistant pneumococcus in Massachusetts following universal immunization of infants with pneumococcal conjugate vaccine JO - Pediatr Infect Dis J IS - 6 VL - 26 PY - 2007 DO - 10.1097/INF.0b013e31803df9ca SP - 468 EP - 472 N1 - , et al. ER -