Acta Veterinaria et Zootechnica Sinica ›› 2025, Vol. 56 ›› Issue (11): 5801-5816.doi: 10.11843/j.issn.0366-6964.2025.11.037

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Meta-analysis of Porcine Reproductive and Respiratory Syndrome Virus Prevalence in China's Yangtze River Delta Region

WU Hanyu(), XIA Xinyue(), XU Yigang, SONG Houhui, WANG Jing*(), YANG Yongchun*()   

  1. Key Laboratory of Applied Technology on Green-Eco-Healthy Animal Husbandry of Zhejiang Province, College of Animal Science and Technology & College of Veterinary Medicine, Zhejiang A&F University, Hangzhou 311300, China
  • Received:2025-01-15 Online:2025-11-23 Published:2025-11-27
  • Contact: WANG Jing, YANG Yongchun E-mail:502268789@qq.com;359027475@qq.com;jingwang@zafu.edu.cn;yyc@zafu.edu.cn

Abstract:

This study aims to systematically evaluate and analyze the prevalence of porcine reproductive and respiratory syndrome virus (PRRSV) in pig populations within the Yangtze River Delta region of China, providing a scientific basis for effective prevention and control strategies. A comprehensive literature search was conducted across five major databases: China National Knowledge Infrastructure (CNKI), Wanfang Data, VIP Chinese Science and Technology Journals Database, PubMed, and Science Direct. Studies on the prevalence of PRRSV in pig populations in the Yangtze River Delta region, collected since the outbreak of PRRSV in China in 1995, was systematically reviewed and subjected to Meta-analysis. A total of 36 articles were included in the Meta-analysis, involving 28 767 pigs, of which 8 277 tested positive for PRRSV. The overall prevalence of PRRSV in pig populations in the Yangtze River Delta region was 35.8% (95% CI: 0.266, 0.456). Among the provinces, Anhui exhibited the highest prevalence at 51.5% (95% CI: 0.321, 0.706), followed by Jiangsu at 45.0% (95% CI: 0.315, 0.589) and Shanghai at 41.2% (95% CI: 0.211, 0.629). Zhejiang had the lowest prevalence at 31.0% (95% CI: 0.213, 0.416). The highest infection rate was observed in suckling piglets (34.1%; 95% CI: 0.181, 0.521), followed by nursery pigs (30.4%; 95% CI: 0.077, 0.598), and finishing pigs (21.5%; 95% CI: 0.115, 0.333). The subgroup analysis and meta-regression analysis revealed that the heterogeneity in the studies was not associated with sampling location, sampling time, diagnostic methods, clinical symptoms, pig developmental stage, or study quality (P>0.05). However, factors such as sample type, feeding practices, and health status were found to significantly affect the prevalence of PRRSV (P < 0.05). The prevalence of PRRSV in pig populations within the Yangtze River Delta region was high. It is essential to maintain continuous monitoring of PRRSV infections, especially the free-range pig and suckling piglets. Additionally, the development and implementation of targeted prevention and control strategies is critical for reducing the risk of viral transmission.

Key words: Yangtze River Delta region, porcine reproductive and respiratory syndrome virus, Meta-analysis, prevalence

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