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I observed lysis plaques all over ATCC P. aeruginosa 27853 soft agar overlay prepared from overnight bacterial cultures. The bacterial strain is reported to contain prophage sequences in its genome. ATCC website also mentions that phage may be present in the culture. Could it be prophage induction (maybe due to stress conditions from high cell densities or spontaneous?) or phage contamination? Please email thongshuhua@gmail.com if you can help!