TY - JOUR T1 - The influence of penicillin on <em>Lactobacillus leichmannii</em> serum B<sub>12</sub> assay JF - Journal of Clinical Pathology JO - J Clin Pathol SP - 189 LP - 192 DO - 10.1136/jcp.14.2.189 VL - 14 IS - 2 AU - Borys Boczarow Y1 - 1961/03/01 UR - http://jcp.bmj.com/content/14/2/189.abstract N2 - The influence of penicillin on vitamin B12 assay using L. leichmannii as the test organism was investigated, and it was found that penicillin even in a low serum concentration invalidated the test. ER -