injection of the suspect ampicillin.This batch of ampicillin was taken out of circulation immediately, and samples were sent for analysis in Europe.Chemical analysis confirmed the presence of ampicillin but also of high concentrations of N, N-dimethylanalin, a degradation product, and of another, unknown, substance.Culture showed Pseudomonas spp and an unknown organism in the first two phials and Bacillus spp and an unknown organism in the second two phials.The laboratory suggested
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Grønbæk et al. (1996) studied this question.
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