TABLE 3.

Erythromycin-resistant enterococci by swine production stage

Species isolated (n)No. of erythromycin-resistant isolates (%) by stage and farm
GestationFarrowingSucklingNurseryFinishing
ABCABCABCABCABC
E. casseliflavus (2)1 (50.0)1 (50.0)0 (0)0 (0)0 (0)
E. durans (25)1 (4.0)1 (4.0)2 (8.0)1 (4.0)0 (0)13 (52.0)0 (0)7 (28.0)0 (0)
E. faecalis (30)3 (10.0)1 (3.3)10 (33.3)3 (10.0)1 (3.3)2 (6.7)8 (26.7)0 (0)0 (0)2 (6.7)0 (0)
E. faecium (11)1 (9.1)1 (9.1)4 (36.4)1 (9.1)1 (9.1)2 (18.2)0 (0)1 (11.1)0 (0)0 (0)
  • a Percent erythromycin-resistant isolates by species resistance was calculated by dividing the number or erythromycin resistant-isolates per species by the total number of erythromycin-resistant isolates per farm.