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Immunoreactivity of sera from uninfected (□) and infected (▿, ○, ▵, ◊) dogs against crude extracts of H. bizzozeronii, H. felis, and H. pylori. Immunoreactivity is expressed as the total density (in square millimeters), which was measured with the NIH Image program on a digitalized image of the immunoblot. The solid bar indicates the mean total density of sera from the four infected dogs for each antigen. Differences between the means were not significant.
