The influence of penicillin on Lactobacillus leichmannii serum B(12) assay.
The influence of penicillin on vitamin B(12) 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.
Boczarow
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Department of Pathology, Stoke Mandeville Hospital, Aylesbury, Bucks.