الفهرس 
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Abstract
Dermatophytosis considered one of the most frequent and important fungal skin diseases affecting both humans and animals. Although equine dermatophytosis is not a life-threatening disease for horses, it receives great attention for many reasons including zoonotic, veterinary and economic significance due to the high cost of treatment and difficulties of control measures. Therefore, its public health importance activated more concern with treatment and control.
Within the present study, out of 460 examined Arabian horses, characteristic lesion of ringworm was detected in 100 (21.74%) horses. The highest rate of infection was observed among those from horse station than sporadic cases (29.1 vs. 11.7%). Also 24 horses were investigated for equine cutaneous and subcutaneous pythiosis. They were admitted to the clinic of faculty of Veterinary Medicine, Zagazig University.
For assessment the ringworm risk factors on both animal and environmental level multivariable logistic regression analysis was used. On horse level, there was a significant association between dermatophytosis and horse’ age (P<0.002; odds: 5.04; CI: 1.18-14.02). Meanwhile, on environmental level increased percentage of dermatophytosis in Arabian horses is associated with drinking and feeding from the same container (P<0.008; odds: 1.8; CI: 1.81-54.35), autumn season (P<0.01; odds: 21.3; CI: 1.9-237) and irregular use of disinfectants (P<0.008; odds: 0.20; CI: 0.06-0.66).
The disease characterized clinically by circular patches of alopecia with variable degree of scaling and crust. The lesions are usually non-painful. The horses had ringworm caused by Microsporum species were mostly having area of dry, flaky to crusty alopecia. While those had ringworm caused by Trichophyton species have thin crusting except in T. schoenleinii and T. verrucosum. Moreover, generalized dermatophytosis is uncommon and was detected only in horses or foal which exposed to diarrhea and/or respiratory signs in isolated unite. The head and neck region are the most affected areas by 35.3% and 27.6%, respectively.