Answer: Probable Strongyloides stercoralis larvae
Higher magnification would be needed to confirm the characteristic features of S. stercoralis filariform larvae (the stage that migrates to the lung during autoinfection). However, the overall appearance and clinical presentation is most consistent with strongyloidiasis hyperinfection.
To answer my question about the last photo - this does not represent a parasite, but might represent a fiber with proteinaceous debris. I was curious to see what others had to say, but no one commented.
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S. Stercoralis filariform larvae's esophagus:intestine ratio is 1:1. On the pictures, we clearly see esophagus being around 3 times shorter than the intestine. Plus, S. Stercoralis filariform larvae has notched tail. on pics, it's strait. I think the worm on the pictures is Hookworm larvae, not Strongyloides.
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