目的 了解山西省晋中市猪刚地弓形虫的感染情况和基因型现状，为猪弓形虫病的防控提供依据。 方法 2021年从山西省晋中市太谷区、平遥县、昔阳县采集猪淋巴组织和肌肉组织，用动物组织提取试剂盒提取样品基因组DNA，半巢式PCR扩增弓形虫B1基因并测序。运用聚合酶链反应-限制性片段长度多态性（PCR-RFLP）方法，扩增弓形虫阳性样品和8个参考虫株的SAG1、5'-SAG2、3'-SAG2、alter. SAG2、SAG3、BTUB、GRA6、c22-8、c29-2、L358、PK1和Apico等12个位点，用限制性内切酶对扩增片段进行酶切，将弓形虫阳性样品的酶切产物与8个弓形虫国际参考虫株进行对比，通过条带大小确定基因型。 结果 山西省晋中市130只猪共检出37份弓形虫阳性样品，阳性率为28.5%（37/130）。其中，太谷区阳性率为32.7%（18/55），平遥县阳性率为26.0%（13/50），昔阳县阳性率为24.0%（6/25）。猪淋巴组织的弓形虫阳性率为33.0%（33/100），肌肉组织的弓形虫阳性率为13.3%（4/30）。在37份弓形虫阳性组织中，1个样品成功扩增和酶切出所有位点，鉴定为ToxoDB#9；1个样品成功扩增和酶切出8个位点，疑似ToxoDB#9、ToxoDB#20或ToxoDB#137；3个样品成功扩增和酶切出6个位点，疑似ToxoDB#9、ToxoDB#20或ToxoDB#137；1个样品成功扩增和酶切出8个位点，疑似Type Ⅰ、ToxoDB#27或ToxoDB#35；1个样品成功扩增和酶切出6个位点，疑似Type Ⅰ、ToxoDB#24、ToxoDB#27或ToxoDB#35。 结论 本研究对山西省晋中市猪弓形虫感染情况进行了分子检测和基因型鉴定，阳性率较高，淋巴组织阳性率高于肌肉组织，PCR-RFLP鉴定出ToxoDB#9基因型和疑似ToxoDB#9、Type Ⅰ基因型样品。

Objective To understand the genotype characteristics of Toxoplasma gondii in Jinzhong City, Shanxi Province, and provide a basis for the prevention and control of toxoplasmosis in pigs. Methods In 2021, pig lymphatic and muscle tissues were collected from Taigu District, Pingyao County, and Xiyang County in Jinzhong City, Shanxi Province. The genomic DNA of the samples was extracted using an animal tissue extraction kit, and the B1 gene of T. gondii was amplified and sequenced using semi-nested PCR. Using the polymerase chain reaction restriction fragment length polymorphism (PCR-RFLP) method, 12 loci including SAG1, 5'-SAG2, 3'-SAG2, alter. SAG2, SAG3, BTUB, GRA6, c22-8, c29-2, L358, PK1, and Apico were amplified from positive samples and 8 reference strains of T. gondii. The amplified fragments were digested using restriction endonucleases, and the digested products were compared with 8 international reference strains of T. gondii. Genotypes were determined by band size. Results A total of 37 positive samples of T. gondii were detected in 130 pigs in Jinzhong City, Shanxi Province, with a positive rate of 28.5% (37/130). Among them, the positive rate in Taigu District is 32.7% (18/55), Pingyao County is 26.0% (13/50), and Xiyang County is 24.0% (6/25). The positive rate of T. gondii in pig lymphoid tissue is 33.0% (33/100), and the positive rate of T. gondii in muscle tissue is 13.3% (4/30). Out of 37 positive tissues for T. gondii, one sample was successfully amplified and all loci were cleaved, identified as ToxoDB#9; One sample successfully amplified and cleaved 8 sites, suspected to be ToxoDB#9, ToxoDB#20, or ToxoDB#137; Three samples were successfully amplified and enzyme cleaved to 6 sites, suspected to be ToxoDB#9, ToxoDB#20, or ToxoDB#137; One sample successfully amplified and cleaved 8 sites, suspected to be Type I or ToxoDB#27 or ToxoDB#35; One sample successfully amplified and cleaved 6 loci, suspected to be Type I or ToxoDB#24, ToxoDB#27, or ToxoDB#35. Conclusion This study conducted molecular detection and genotype identification of T. gondii infection in pigs in Jinzhong City, Shanxi Province. The positivity rate was high, and the positivity rate in lymphoid tissue was higher than in muscle tissue. ToxoDB#9 genotype and suspected ToxoDB#9 or Type Ⅰ genotype samples were identified by PCR-RFLP.