Agreement among deep nasopharyngeal sampling culture results for 3 different swab types in preweaning dairy calves

Summary: This article compares 3 different types of swabs for deep nasopharyngeal sampling of preweaning dairy calves. Findings from our study support that when using either single- or double-guarded swabs, there is a high agreement for recovery of Pasteurella multocida. Unguarded swabs are a potential alternative but result in a higher percentage of polymicrobial growth when cultured.