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Comparison of morbidities, positive rates of fecal samples, and average litter sizes between control and vaccinated groups. (a) Comparison of morbidities between control and vaccinated groups in Zhuanghe, Zhucheng, and total. (b) Comparison of positive rates of fecal samples between control and vaccinated groups in Zhuanghe, Zhucheng, and total. (c) Comparison of average litter sizes between control and vaccinated groups in total (* p < 0.05; ** p < 0.01).
