(1) Standardization of penicillinase has been made possible by the method for its assay. (2) A purified, dried and sterile penicillinase has been found to be a penicillin-inactivator superior to Clarase for the penicillin sterility test. (3) Preliminary studies show this penicillinase preparation may be used for inactivating penicillin in exudates of body fluids.

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It has been found that an anti-penicillinase immune serum can be produced, in rabbits by the use of purified penicillinase as the antigen. Anti-penicillinase serum is suggested as protection for penicillin from inactivation by penicillinase.

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