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Results in three county laboratories. (A) Libo of Guizhou province. 1(-): Negative control (stem tissue). 2(+) - 5(+): Suspected samples. 6(+): Positive control. (B) Shidian of Yunnan province. 1(+) - 6(+): Suspected samples collected from Shidian in Yunan province. 7(+): Positive control. (C) Jianghua of Hunan province. 1(+) - 5(+): Suspected samples. 6(+): Positive control. 7(-): Negative control (stem tissue).
