Giemsa staining of HCMs and bacteria was performed according to methods described previously by Rajan et al. (85 (link)) and Tatsuno et al. (86 (link)). HCMs were infected with EHEC strains as described above. Bacteria and infected cells were imaged under a Zeiss Primovert inverted microscope at a ×40 magnification. Bacterial clusters on HCMs containing >8 bacteria were considered MCs (86 (link)). The number of MCs was scored as the sum from 20 random microscopic fields. A technician counted the MCs in a blind manner to ensure objectivity.
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