Fig. 3From: Serological testing of an equal-volume milk sample – a new method to estimate the seroprevalence of small ruminant lentivirus infection?The relationship between the proportion of seropositive individual milk samples in the equal-volume milk sample (EVMS%POS) and the optical density of EVMS (ODEVMS) in competitive ELISA based on surface glycoprotein antigen (SU-cELISA). Black broken line is a cut-off separating positive and negative EVMSBack to article page