Evaluation of changes in antimicrobial susceptibility patterns of Pasteurella multocida subsp multocida isolates from pigs in Spain in 1987-1988 and 2003-2004.

Objective: To determine the susceptibility of strains of Pasteurella multocida subsp multocida isolated from lung specimens of pigs with pneumonia to 20 antimicrobials and to evaluate the emergence of resistance to those antimicrobials in Spain during the past 2 decades.

Sample Population: 63 isolates recovered from 1987 to 1988 and 132 isolates recovered from 2003 to 2004.

Procedure: A broth microdilution method was used to determine minimal inhibitory concentration (MIC) range and values for MIC50 and MIC90.