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Phylogenetic tree based on 470-nt 5′ partial VP1 sequences of all environmental E6 isolates in Shandong Province. A circle indicates the prototype strain D'Amori, and diamonds indicate the E6 isolates from the sewage collected on 11 August 2010. The remaining nine E6 isolates were collected at other times. The isolates are identified by a code that consists of JNEW, followed by the sample date (presented as YYMMDD [i.e., year, month, day]), and the tube number.
