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Immunoreactivity (seroconversion) of serum samples from cattle experimentally infected with virulent LSD isolate. (A) Two cattle were inoculated, and samples were collected at 0, 6, 12, 18, 20, 23, 26, and 30 days post-infection (DPI). Note the rise in immunoreactivity between 12 and 18 DPI for cattle. The data represent the average of two runs in duplicate ± standard deviation.
