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Incidence and amount of PCV2 DNA in serum quantified by SYBR green I real-time polymerase chain reaction. (A) PCV2 prevalence in the serum of pigs following intranasal and intramuscular inoculations with PCV2. (B) The mean viral load of the PCV2-positive pigs (Log10) from different groups. Values are expressed as mean counts±standard error.
