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A new antibiotic, U-21,963, is produced by a new strain of Trichoderma viride. Antibiotic activity can be demonstrated against both gram-positive and gram-negative bacteria and also against a wide variety of fungi. U-21,963 is not cross-resistant with other commonly used antibiotics. U-21,963 afforded no protection against Klebsiella pneumoniae, Streptococcus pyogenes, or Staphylococcus aureus when it was injected subcutaneously into mice.
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Pyke et al. (1966) studied this question.
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