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How can I tell if my adult long-haired cat has a ringworm infection?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 13 lbs

How can i determine if my adult long haired cat has ringworm infection

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2 Answers

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Answered By Megan, DVM, CVA

Veterinarian

Published on December 26th, 2017

Poor Fupal! This looks like an extensive bacterial or fungal infection but not necessarily ringworm. You would need some hair for a culture called a DTM to diagnose ringworm. Since it is such a large area affected, I would have your vet take a look at it. Your vet will be able to start him on the proper meds and even take a biopsy or hair samples if needed to help determine the cause. I hope this helps!

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    Answered By Dr. Melanie, BVSc MS

    Veterinarian

    Published on September 3rd, 2020

    From the pictures, those do not look like typical ringworm lesions, but I cannot make a diagnosis without seeing the cats in person. I'd have them seen by a vet. The vet can use a Wood's lamp as well as a fungal culture to see if they do have ringworm. If they do, the vet can prescribe an oral medication. Topical medications for ringworm typically do not work on cats because Microsporum canis (fungal organism causing ringworm) is spread diffusely throughout a cat's entire hair coat, such that an isolated topical spray will not cover all surfaces of every hair, and lead to frequent recurrence. Give the vet a call now to make them an appointment. I hope this helps!

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