For our experiments, a MRSA strain (strain ID: BfR 08S00974, ITU 1179) of the sequence type (ST) 398 and the spa type t011 was obtained from the “Federal Institute for Risk Assessment” (BfR) and used as previously reported [4 (link), 12 (link)]. Briefly, MRSA was streaked out on blood base agar plates (Blood Agar Base No. 2, Oxoid, Germany) and incubated for 8 h. Then, the plates were suspended with PBS, adjusted to McFarland 0.5 and diluted to the defined MRSA concentration. The suspension was split into portions of 50 mL and stored on ice until aerosolization.