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Increasing the pH from 5 to 9 decreased the toxicity of mercuric chloride, zinc sulfate, lead nitrate, copper sulfate and nickel chloride toward the growth of Aspergillus flavus, Penicillium chrysogenum, Cunninghamella echinulata, Myrothecium verrucaria and Phoma humicola. On the other hand, the toxicity of cadmium chloride was increased by the increasing pH. Also increasing the concentration of organic matter (peptone and yeast extract) from 0.5 to 1.5% induced a significant reduction in the toxicity of all heavy metals toward the growth of all test fungi.

The frequency of occurrence of fungi in 260 hair samples of dog, donkey and cow collected from Veterinary Medicine Hospital of Assiut University was determined. Twenty-three species which belong to fifteen genera were collected. In low frequency, several dermatophytes (Chrysosporium, Microsporum, Arthroderma and Trichophyton) were found as well as some other fungal species pathogenic to man and animals (Aspergillus fumigatus, Stachybotrys chartarum, Scopulariopsis brevicaulis and Cephalosporium acremonium).