Additional File 3.

Transverse scan of left testis. The same worm nests as seen in movie 1A and 1B. The caliper marks the position at which the PWD is performed. After switch to the Pulse Wave Doppler-mode the filaria dance sign (FDS) is seen as an undulating band as a function of time, with sharp, irregular peaks (turquoise arrowhead).

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