We are growing MCF-7 and MG63 cell lines. Recently we have noticed that after 3-4 days the culture medium shows black, thin, very motile rods and pH turns alkaline. I centrifuged the mediun and then plated on nutrient agar but nothing grows. The cells fragment and culture is lost. For 1-2 days incubation, nothing happens, cells look healthy. Can anybody suggest some remedy?

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