http://www.cdc.gov/dpdx/strongyloidiasis/gallery.html The 3rd stage of strongyloides is the filaria stage . The encysted ones are normally found in colon lining and when they awake they have a buffet of bacteria in colon to feed on (itchy butt hole stage ) . I agree with doxy being used for filaria worms and strongyloides have a filaria stage .