FIG. 4.

Recombinant AHP1 immunoblot using preinfection (A) and postinfection sera (B) of rabbits (1 to 6) obtained 2 weeks after the challenge (Table 1, sera 1, 2b, 3b, 4b, 5, and 6). The arrow points to the position calculated for AHP1 (molecular mass of ∼18.5 kDa). The additional reactive upper band (∼35 kDa) that was detected with antiserum from rabbit 3 may reflect dimerized AHP1. An asterisk indicates rabbits in which postinfection sera led to the isolation of the AHP1 antigen by phage library screening.