Uterine bacterial isolates from mares and their resistance to antimicrobials: 8,296 cases (2003-2008).

Objective: To describe bacteria isolated from reproductive tracts of mares and to examine the extent and patterns of resistance to antimicrobials commonly used for treatment of endometritis.

Design: Retrospective case series.

Sample: 8,296 uterine swab, lavage, or biopsy samples obtained between January 2003 and December 2008 from 7,665 horses in central Florida.