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. 2010 Jul 15;147(3):329–339. doi: 10.1016/j.vetmic.2010.07.005

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Fig. 4 — Distribution of the frequency of sows with SIV antibodies and antibodies titres for subtypes H₁N₁, H₁N₂ and H₃N₂ 4 weeks after farrowing in five farrow-to-finish pig herds (12 sows/herd).