The fermentation broth of Pleurotus tuber-regium showed significant antimicrobial actions on bacteria, especially on Gram-negative bacteria, hut not antimicrobial actions on yeast and mould.

• 虎奶菇发酵液对细菌特别是革兰氏阳性菌有明显的抑制作用，而对酵母、霉菌没有抑制作用。