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Seroprevalence of EA H1N1 SIVs in Liaoning province. (A) Sampling instructions for each city in Liaoning. (B). Seroprevalence of EA H1N1 SIVs in sampling cities and among herds of pigs of diverse ages in Liaoning. SY, Shenyang; FS, Fushun; PJ, Panjin; DL, Dalian; JZ, Jinzhou; FX, Fuxin; LY, Liaoyang; AS, Anshan; TL, Tieling; CY, Chaoyang; HLD, Huludao.
