Table 1.

Western blot assay characterization of serum samples

Serum setNo. of samples availableNo. blot positive (%)a
17 kDa27 kDa
Georgia nonoutbreak7446 (62)b 68 (92)e
Georgia early outbreak3311 (33)c,d 17 (52)e,f,g
Georgia late outbreak
 Total9691 (95)b,c 95 (99)f
 Symptomatic7673 (96)76 (100)
 Asymptomatic2018 (90)19 (95)
Washington late outbreak
 Total3528 (80)d 34 (97)g
 Symptomatic2522 (88)25 (100)
 Asymptomatic106 (60)9 (90)
  • a Frequencies indicated by the same footnote letters (b to g) were found to have significant differences by the Freeman-Tukey test.

  • b P = 0.0001.

  • c P = 0.0001.

  • d P = 0.0018.

  • e P = 0.0002.

  • f P = 0.0001.

  • g P = 0.0001.