Abstract
As a quarantine of biological materials, we tested 96 transplantable tumors and cell lines for contamination with microorganisms in a mouse antibody production (MAP) test, enzymatic assay and microbiological culture. Contamination with lactic dehydrogenase elevating virus (LDV), mycoplasmas and Pasteurella pneumotropica was detected. A considerable difference in the contamination rate was observed between in vivo- and in vitro- propagated tumors. LDV in the tumors could be eliminated by both in vitro subculture and subpassage in nude rats. Mycoplasmas were eliminated by means of the mycoplasma-removal agent and P. pneumotropica by subpassage in mice. These results suggest that there is still a high risk of contamination in transplantable tumors and emphasizes the importance of adequate microbiological quality control.
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