Sheep Infection Trials with ‘Phase-Locked’ Vpma Expression Variants of <i>Mycoplasma agalactiae</i>—Towards Elucidating the Role of a Multigene Family Encoding Variable Surface Lip... oleh Rohini Chopra-Dewasthaly, Andreas Dagn, Christian Lohinger, René Brunthaler, Martina Flöck, Munkhtsetseg Kargl, Shrilakshmi Hegde, Joachim Spergser, Renate Rosengarten