Dot-ELISA of naturally infected rabbit experimental sera with rTpFABP. The tan-yellow tint shows the positive reaction: A, negative control sera; B, positive antisera; C, sera at 0 day post-infection; D, sera at 7 days post-infection; E, sera at 14 days post-infection; F, sera at 21 days post-infection; G, sera at 28 days post-infection; H, sera at 35 days post-infection; I, sera at 42 days post-infection; J, sera at 49 days post-infection.