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Confocal fluorescence images of live and dead S. aureus co-labeled with CDs-EPS605 and PI. The excitation wavelength was 488 and 552 nm for CDs-EPS605 and PI, respectively. In the red squares, two dead S. aureus cells were co-labeled by both CDs-EPS605 and PI, while one live S. aureus cell was not stained.
