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I have got stuck with the bottom right corner. To let me move on can anybody tell me that 25a is coccidia. Thanks.

What is the clue?

Parasitic worms found in dogs/cats which cause disease.

Presuming it fits your crossers looks good.

Thanks but I think some of my crossers must be wrong. Cheers.

Sorry, without the puzzle - letter count and any placed it is hard to help.

Ascarids is another possible.

Good evening, Precise.
My apologies for coming so late to the party, but I've just seen your post.
You have probably found the answer by now, but if not, it's "toxocara"
All the best!
Al Issner

Thank you Al-Issner. My crossers seem to be correct.