The PCR products were sequenced in both directions in the Children’s Hospital DNA Core Facility (Cincinnati, OH) using an Applied Biosystems Prism 3730 XL DNA analyzer. The raw gene sequences were processed using Sequencher software (Gene Codes, Ann Arbor, MI). For the 16S rRNA gene sequences, homology searches of DNA sequences in the GenBank (nonredundant [NR]) database were undertaken with the National Center for Biotechnology Information (NCBI) BLASTn program (http: //www.ncbi.nlm.nih.gov/BLAST/)(16).