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Determination of the amount of the viable B. suis S2 strain by PMA-qPCR and plate counting methods. Pure bacterial liquid – B. suis cultured in TSB; A – B. suis harbouring in mouse macrophage RAW 264.7 cells infected with 1.28 × 1012 CFU/mL of B. suis S2 strain; B – B. suis harbouring in mouse macrophage RAW 264.7 cells infected with 0.64 × 1012 CFU/mL of B. suis S2 strain; * P < 0.05
