Analysis on Porcine Circovirus Detection Results in Some Swine Farms in China from 2018 to 2023
In order to identify the prevalence status and characteristics of porcine circovirus(PCV)disease in China,the testing results based on 77 574 samples delivered by 8 064 swine farms from 2018 to 2023 in 23 provinces(autonomous regions and municipalities)including Henan,Shandong,Hunan,Sichuan,Guangdong and Guangxi were statistically analyzed.Antigen detection results showed that the detection rate of PCV type 2(PCV-2)decreased and then increased,from 58.3％in 2018 to 25.7％in 2020,and then to 37.8％in 2023,was higher(＞60％)in April to May,and tended to increase in the four stages of reserve pigs,parturient sows,nursery pigs at 30 to 60 days old and fattening pigs at 160 to 180 days old,dominated by PCV-2d genotype(75.9％);the detection rate of PCV-3 antigens remained relatively stable(annual rate of 26.9％),higher in June and December(＞85％),especially in nursery pigs at 30 to 60 days old(35.7％)and for PCV-3c genotype(66.0％).Antibody detection results showed that the positive rate of PCV-2 tended to decrease from 2018 to 2023,fluctuating with months,with differences among herds,and was highest in boars and parturient sows(＞90％),and tended to decrease in commercial pigs at 30 to 120 days old with their increasing days of age,to 71.8％at 120 days old,but tended to increase in those at 120 to 160 days old.In conclusion,PCV-2/PCV-3 was widely and seriously prevalent in pig herds in China,and distributed depending on different seasons and herds to certain extent,with dominant epidemiological genotypes,and the level of antibodies against PCV-2 was low in commercial pigs,especially those at 120 days old,posing a risk of occurrence of outbreaks.Based on the above analysis,all farms should strengthen their monitoring and control over PCV infection,take targeted preventive and control measures according to the epidemiological characteristics and antibody level of the virus,and carry out vaccination in time to prevent any loss that might be caused by the occurrence of any outbreak.
万方数据
维普
