Volume 23, no. 3, p. 493, abstract: "The activities of seven broad spectrum cephalosporins, four other ,B-lactam antibiotics, and one monobactam.. . ." should read "The activities of seven broadspectrum cephalosporins and five other 3-lactam antibiotics...." Page 493, column 1, lines 12-14: ".. . we tested seven of the new broad-spectrum cephalosporins, four other ,-lactam antibiotics, and one monobactam... ." should read "... we tested seven of the new broad-spectrum cephalosporins and five other 3-lactam antibiotics...." Page 493, column 2, lines 3-6: ".. . and the monobactam Sch 29,482. Sch 29,482, an oral penem highly resistant to ,-lactamase, has been reported to be highly active... ." should read ".... and Sch 29,482, an oral penem highly resistant to P-lactamase and reportedly highly active...." Page 494, column 1, lines 28-33: "The only other monobactam that has been tested against C. trachomatis is SQ 26,776 (5), which was reported to be inactive, with-100 .g/ml needed to suppress normal inclusions. We found Sch 29,482 to be more active, with a mean MIC of 28 FLg/ml" should read "The mean MIC of Sch 29,482 was 28 ,g/ml."