How is ringworm diagnosed in cats? - briefly
Ringworm in cats is typically diagnosed through a combination of a Wood's lamp examination, microscopic analysis of hair or skin samples, and fungal culture to confirm the presence of dermatophytes.
How is ringworm diagnosed in cats? - in detail
Ringworm in cats is diagnosed through a combination of clinical examination and specialized diagnostic tests. A veterinarian typically begins by inspecting the cat’s skin for characteristic signs such as circular, scaly, or hairless patches, though these symptoms alone are not definitive for ringworm. To confirm the diagnosis, several methods are employed. One common technique is the use of a Wood’s lamp, which emits ultraviolet light. Certain species of the fungus Microsporum canis, a primary cause of ringworm, may fluoresce under this light. However, not all ringworm cases will show fluorescence, and false positives can occur due to other substances on the skin. For a more accurate diagnosis, a fungal culture is often performed. This involves collecting hair or skin samples from the affected area and placing them on a special medium that promotes fungal growth. The culture is monitored for several weeks to identify the presence of dermatophytes. Microscopic examination of skin scrapings or hair samples treated with potassium hydroxide (KOH) can also reveal fungal elements, though this method requires expertise to interpret accurately. In some cases, a polymerase chain reaction (PCR) test may be used to detect fungal DNA, providing rapid and precise results. These diagnostic tools, combined with the cat’s clinical presentation and history, allow veterinarians to confirm ringworm and initiate appropriate treatment.