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Mean PCV2 antibody titres in cases versus controls (controls from PMWS-free herds (a), controls within case herds but from another compartment as cases (b), controls within the same compartment as cases (c), and cases, respectively) (n=60 per group). SD are expressed per group as lines. PCV2 antibody titres are expressed as twofold dilution steps starting a serum dilution of 1:100 (i.e. “1”= 1:100 dilution and “12”=1:204.800).
