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Anti-N-AND IgG responses in sera from rodents infected experimentally. Blood samples were collected at the indicated days postencounter and were examined for reactivity to the N-AND antigen by ELISA. Data are presented in IgG units, in which the OD of each test sample was divided by the OD of the positive control sample run on the same microtiter plate. Samples with titers less than 0.2 IgG units (indicated with dashed line) were considered negative.
