in C57BL/6N and C3H/HeN mice. Pulmonary clearance of Mycoplasma pulmonis

8.88 CFUofM.pulmonis in the nebulizer. Exposure lastedfor 30 min with replacement ofthe culture in the nebulizerevery 5 min, with a diluting air flow of20 liters/min and anebulizer air flow of5 liters/min. Theaerodynamicdiameterforeachexposurewasdeterminedwithmassdata. Themassmedian aerodynamic diameter averaged 1.93 ,um (standarderror ofthe mean