Yearly changes in number of serotypes and in penicillin resistance in genotypes found in isolates from adults with invasive pneumococcal diseases, Japan, April 2010-March 2013. Serotypes are shown for each of the 3 yearly surveillance periods: April 2010-March 2011, April 2011-March 2012, and April 2012-March 2013. Short tic marks on horizontal axis represent yearly number of isolates for specific serotypes; longer tic marks represent the 3-year surveillance period for each serotype. gPSSP, genotypic penicillin-susceptible Streptococcus pneumoniae; gPISP, genotypic penicillin-intermediate resistant S. pneumoniae; gPRSP, genotypic penicillin-resistant S. pneumoniae. Parentheses enclose abnormal pbp genes that mediate penicillin resistance.