From: Epidemiological investigation of porcine circovirus type 2 and its coinfection rate in Shandong province in China from 2015 to 2018
Year
Number of samples
Number of positive samples
Positive rate
2015
140
56
40.00%
2016
292
91
31.16%
2017
442
191
43.21%
2018
451
152
33.70%
Total
1325
490
36.98%