%0 Journal Article %A GL Ridgway %T Practical Medical Microbiology %D 1989 %R 10.1136/jcp.42.12.1315-a %J Journal of Clinical Pathology %P 1315-1315 %V 42 %N 12 %U https://jcp.bmj.com/content/jclinpath/42/12/1315.1.full.pdf