Mtb H37Rv strain 27294 was purchased from the American Type Culture Collection (ATCC). They were grown in Middlebrook 7H9 broth containing 10% oleic acid-albumin-dextrose-catalase (OADC) and 0.05% Tween-80 at 37 °C. They were washed with PBS and passed through a syringe, to disrupt the clumps, before infecting human MDMs.
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