RT Journal Article SR Electronic T1 A comparison of three rapid methods for the detection of beta-lactamase activity in Haemophilus influenzae. JF Journal of Clinical Pathology JO J Clin Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 1030 OP 1032 DO 10.1136/jcp.30.11.1030 VO 30 IS 11 A1 Skinner, A A1 Wise, R YR 1977 UL http://jcp.bmj.com/content/30/11/1030.abstract AB Three methods for rapidly detecting beta-lactamase activity in Haemophilus influenzae are compared. The chromogenic cephalosporin method was found to be the most easily performed and the reagents could be stored for up to three weeks. The phenol red method was simple to perform but the iodometric method was more time consuming. All three tests gave identical results.