Phylogenetic analysis of 18S small subunit SSU rRNA gene sequences of B. microti in the malaria-endemic area along the China-Myanmar border in the Yunnan province, April 2012 to June 2013. Fragments of 18S SSU rRNA gene sequences of samples were analyzed by aligning with published homologous sequences of B. microti from different countries or regions. A phylogenetic tree was constructed on the basis of similarities by the MegAlign software (DNASTAR, Inc. Madison, WI, USA). Novel sequences identified in this study are indicated in boldface. Scale bar indicates nucleotide substitutions per site.