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Table 3 Summary of ELISA scores sorted by era of collection and country of origin

From: Serological evidence for historical and present-day exposure of North American bison to Mycoplasma bovis

ELISA score No. (%) of sera collected in 1999 or prior in the country indicated No. (%) of sera collected in 2000 or later in the country indicated
United States Canadaa Total United States Canada Total
Neg 673 (90.6) 723 (95.0) 1396 (92.8) 802 (95.0) 870 (91.9) 1672 (93.4)
1+ 43 (5.8) 20 (2.6) 63 (4.2) 22 (2.6) 41 (4.3) 63 (3.5)
2+/3+ 18 (2.4) 17 (2.2) 35 (2.3) 14 (1.7) 24 (2.5) 38 (2.1)
4+/5+ 9 (1.2) 1 (0.1) 10 (0.7) 6 (0.7) 12 (1.3) 18 (1.0)
Total 743 761 1504 844 947 1791
  1. aAs a result of rounding individual percentages to the nearest tenth, the sum of all percentages does not equal 100