Additional File 1.

Transverse scan of left testis. In para-testicular position an enlarged lymphatic vessel can be seen (arrow). One or more adult worms are detectable by their typical movements (filaria dance sign, FDS). The following m-mode imaging presents the dilated lymphatic vessels, containing moving adult worms, as a section marked by the cursor in the b-mode image.

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Mand et al. Filaria Journal 2003 2:3   doi:10.1186/1475-2883-2-3