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Titers, expressed as optical density on day 0 and 35 from 31 horses involved in an EHV-1 outbreak. Based upon the manufacturer’s recommendations, antibody concentrations were considered negative, doubtful or positive if the optical density (OD) of the test well was <0.1, 0.1–0.2 and >0.2 OD respectively. The green and red dotted lines represent cutoffs at 0.1 and 0.2 OD, respectively.
