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. 2024 Jan 25;86(3):322–324. doi: 10.1292/jvms.23-0032

Table 2. Positive rates of serum antibodies to Yersinia outer membrane protein in domestic pigs in Chiba prefecture, Japan by year.

Sampling Year No. of Yersinia positive samples/
No. of samples tested (%)
No. of Yersinia positive pig farms/
No. of pig farms tested (%)
2017 44 / 80 (55.0)a 13 / 16 (81.3)
2018 32 / 80 (40.0)b 11 / 16 (68.8)
2019 52 / 80 (65.0)c 13 / 16 (81.3)
2020 61 / 240 (25.4) 16 / 23* (69.6)
2021 57 / 170 (33.5) 15 / 16* (93.8)

Total 246 / 650 (37.8) 70 / 89 (78.7)

The χ2 test and Fisher’s exact test were used to calculate significant differences. a 2017 greater than 2020 and 2021 (P<0.05). b 2018 greater than 2020 (P<0.05). c 2019 greater than 2018, 2020 and 2021 (P<0.05). *Some farms were sampled in duplicate.