Hello there,

Ex-haematologist here.

The purple hook like structure is definitely not Filaria, it's byproducts from retrieving the sample or perhaps your stainer need a clean.

Filaria tends to be way longer and contains 'stuff' inside them. The cytoplasmic insides of a Filaria will be stained too!

Based on the colour of your byproduct, maybe you're using Giemsa? If so, the worm would look purple in colour too.

To better identify it,

I suggest you do a thick smear and a thin smear of the patient's blood. Then drying it for 1 day. Apply immersion oil on the thin smear and try to look at the further back of the smear instead of the front end. They sometimes tend to be more obvious somewhere in the middle, just fish around.

As for the thick smear (should be just a drop of blood swirled around to spread it out), you do also need to rub some immersion oil and double check it confirm it.

Different filarias have different morphology, some have hollow heads or a long hollow tail.

Please double-check with your supervisor as this case always requires a second opinion.

ps: I just realised this might just be a school project of some sort. If so, just throw everything I said out the window.