FIG. 5.

DNA maximum-likelihood phylogram inferred from the nucleotide sequences of 18 16S rRNA gene fragments (527 bp at the 5′ end) originating from E. risticii strains from 14 horses and four snails (the snail designations are underlined). Four of the sequences are for equine E. risticii reference strains: E. risticii Illinois (type strain; GenBank accession no. M21290), E. risticii Kentucky (38), E. risticii Ohio 081 (38), and the E. risticii SRC agent (19). Two snail-derived E. risticii strains (SHSN-1 and SHSN-2; GenBank accession nos. AF037210 and AF037211, respectively) are also included.