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Yu X, Mu X, Yuan K, Wang S, Li Y, Xu H, Li Q, Zeng W, Li Z, Guo J, Hong Y. Occurrence and Genotypic Identification of Blastocystis spp. and Enterocytozoon bieneusi in Bamaxiang Pigs in Bama Yao Autonomous County of Guangxi Province, China. Animals (Basel) 2024; 14:3344. [PMID: 39595396 PMCID: PMC11591291 DOI: 10.3390/ani14223344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2024] [Revised: 11/10/2024] [Accepted: 11/13/2024] [Indexed: 11/28/2024] Open
Abstract
Blastocystis spp. and Enterocytozoon bieneusi are common intestinal pathogens capable of infecting both humans and animals, which lead to severe diarrhea and other intestinal diseases, posing a threat to public health. The Bamaxiang pig, a specialty of Bama Yao Autonomous County in Guangxi Province, China, is an important local breed in the regional pork market and an excellent model animal for biomedical research. Currently, no data is available on the prevalence or genotype distribution of these pathogens in Bamaxiang pigs. This study aimed to determine the prevalence and genetic characteristics of Blastocystis spp. and E. bieneusi in three Bamaxiang pig farms located in Bama Yao Autonomous County, using molecular techniques based on the small subunit ribosomal RNA (SSU rRNA) gene fragment of Blastocystis spp. and the internal transcribed spacer (ITS) region of E. bieneusi. All positive PCR products from the 311 fecal samples were sequenced to identify the species and genotypes of these organisms. The overall infection rates of Blastocystis spp. and E. bieneusi were 34.08% (106/311) and 18.32% (57/311), respectively. Three subtypes of Blastocystis spp. were detected: ST1 (n = 8), ST3 (n = 3), and ST5 (n = 95). Among them, zoonotic ST5 was the dominant genotype, accounting for 89.62% (95/106) of strains, followed by the genotypes ST1 (7.54%, 8/106) and ST3 (2.83%, 3/106). Two genotypes of E. bieneusi were detected: EbpC (n = 52) and CHG23 (n = 5), with EbpC being the dominant genotype. The human-pathogenic subtypes (ST1, ST3, and ST5) and genotypes (EbpC, CHG23) that were observed in this study indicate a potential threat to public health. Our findings offer basic information for preventing and controlling these zoonotic pathogens in the study area. Additional investigations are necessary to better understand their genetic characteristics and zoonotic potential within Guangxi Province.
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Affiliation(s)
- Xingang Yu
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Xuanru Mu
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Kaijian Yuan
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Sifan Wang
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Yilong Li
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Hui Xu
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Qiaoyu Li
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Wenjing Zeng
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Zhili Li
- School of Animal Science and Technology, Foshan University, Foshan 528231, China; (X.Y.); (X.M.); (K.Y.); (S.W.); (Y.L.); (H.X.); (Q.L.); (W.Z.); (Z.L.)
| | - Jianchao Guo
- Agro-Tech Extension Center of Guangdong Province, Guangzhou 510500, China
| | - Yang Hong
- National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention (Chinese Center for Tropical Diseases Research), National Health Commission of the People’s Republic of China (NHC) Key Laboratory of Parasite and Vector Biology, World Health Organization (WHO) Collaborating Center for Tropical Diseases, National Center for International Research on Tropical Diseases, Shanghai 200025, China
- Hainan Tropical Diseases Research Center (Hainan Sub-Center, Chinese Center for Tropical Diseases Research), Haikou 571199, China
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Stensvold CR, Andersen LO, Gentekaki E. Towards minimizing second-generation mis-identification of Blastocystis. Trends Parasitol 2024; 40:670-674. [PMID: 38871578 DOI: 10.1016/j.pt.2024.06.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2024] [Revised: 05/31/2024] [Accepted: 06/03/2024] [Indexed: 06/15/2024]
Abstract
At least 1-2% of DNA sequences annotated as Blastocystis in GenBank represent organisms other than Blastocystis or sequence artefacts. As well as being biologically incorrect, such practice can lead to overestimates of genetic diversity, underestimated host specificity, and incorrect classification of samples tested for Blastocystis using DNA-based methods.
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Affiliation(s)
- Christen Rune Stensvold
- Laboratory of Parasitology, Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark.
| | - Lee O'Brien Andersen
- Laboratory of Parasitology, Department of Bacteria, Parasites and Fungi, Statens Serum Institut, Copenhagen, Denmark
| | - Eleni Gentekaki
- Department of Veterinary Medicine, University of Nicosia School of Veterinary Medicine, Nicosia, Cyprus
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Fusaro C, Bernal JE, Baldiris-Ávila R, González-Cuello R, Cisneros-Lorduy J, Reales-Ruiz A, Castro-Orozco R, Sarria-Guzmán Y. Molecular Prevalence and Subtypes Distribution of Blastocystis spp. in Humans of Latin America: A Systematic Review. Trop Med Infect Dis 2024; 9:38. [PMID: 38393127 PMCID: PMC10893338 DOI: 10.3390/tropicalmed9020038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 01/21/2024] [Accepted: 01/24/2024] [Indexed: 02/25/2024] Open
Abstract
Blastocystis spp. are among the few enteric parasites with a prevalence that can reach up to approximately 80% in communities of developing countries. This systematic review updates and summarizes available literature on the molecular prevalence and subtype distribution of Blastocystis spp. in Latin American people. This work follows the PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses) guidelines. The literature revised covers from 1 January 2015 to 6 October 2023 in seven different scientific databases, and the material was selected through inclusion and exclusion criteria. According to data found in the 36 selected articles, the prevalence of Blastocystis spp. in Latin America ranged between 5.8% (Bolivian rural communities) and 94.0% (Colombian general public). Generally, genomic DNA was extracted from approximately 200 mg fecal sediments using commercial kits, such as the QIAamp Stool Mini Kit (QIAGEN, Hilden, Germany) or the Norgen Stool DNA Isolation Kit (Norgen Biotek Corporation, Thorold, ON, Canada). Subtype-specific primers (such as the couple of primers BhRDr-RD5) developed from unique sequences of the SSU rRNA gene were applied to Blastocystis subtyping. Ten specific subtypes (STs) were found as well as various mixed infections, and the most circulating Blastocystis STs were in the order ST3, ST1, ST2, and ST4. The most recent data about Blastocystis spp. molecular epidemiology and the STs in communities of Latin America are limited to studies from specific countries. Novel scientific data from the other countries are required to obtain a complete picture and truly understand the distribution and prevalence of Blastocystis spp. and the STs.
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Affiliation(s)
- Carmine Fusaro
- Facultad de Ingenierías, Universidad de San Buenaventura, Cartagena de Indias, Bolivar 130010, Colombia; (C.F.); (J.C.-L.); (A.R.-R.)
| | - Jaime E. Bernal
- Facultad de Medicina, Universidad del Sinú, Cartagena de Indias, Bolivar 130001, Colombia;
| | - Rosa Baldiris-Ávila
- Facultad de Ciencias Exactas y Naturales, Universidad de Cartagena, Cartagena de Indias, Bolivar 13001, Colombia;
| | - Rafael González-Cuello
- Facultad de Ingeniería, Universidad de Cartagena, Cartagena de Indias, Bolivar 130015, Colombia;
| | - Julio Cisneros-Lorduy
- Facultad de Ingenierías, Universidad de San Buenaventura, Cartagena de Indias, Bolivar 130010, Colombia; (C.F.); (J.C.-L.); (A.R.-R.)
| | - Arley Reales-Ruiz
- Facultad de Ingenierías, Universidad de San Buenaventura, Cartagena de Indias, Bolivar 130010, Colombia; (C.F.); (J.C.-L.); (A.R.-R.)
| | - Raimundo Castro-Orozco
- Facultad de Ciencias de la Salud, Universidad de San Buenaventura, Cartagena de Indias, Bolivar 130010, Colombia;
| | - Yohanna Sarria-Guzmán
- Facultad de Ingeniería, Universidad de Cartagena, Cartagena de Indias, Bolivar 130015, Colombia;
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Liang Y, Liu YY, Mei JJ, Zheng WB, Liu Q, Gao WW, Zhu XQ, Xie SC. Molecular Identification and Genotyping of Cryptosporidium spp. and Blastocystis sp. in Cattle in Representative Areas of Shanxi Province, North China. Animals (Basel) 2023; 13:2929. [PMID: 37760332 PMCID: PMC10525831 DOI: 10.3390/ani13182929] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 09/04/2023] [Accepted: 09/12/2023] [Indexed: 09/29/2023] Open
Abstract
Both Cryptosporidium spp. and Blastocystis sp. are common intestinal protozoa, which can cause zoonotic diseases and economic losses to livestock industry. To evaluate the prevalence and genetic population structure of Cryptosporidium spp. and Blastocystis sp. in beef and dairy cattle in Shanxi Province, north China, a total of 795 fecal samples were collected from beef and dairy cattle in three representative counties in Shanxi Province, and these fecal samples were examined using molecular approaches based on 18S small-subunit ribosomal RNA (SSU rRNA) of Cryptosporidium spp. and Blastocystis sp., respectively. Among 795 cattle fecal samples, 23 were detected as Cryptosporidium-positive and 103 were detected as Blastocystis-positive, and the overall prevalence of Cryptosporidium spp. and Blastocystis sp. in cattle in Shanxi Province was 2.9% and 13.0%, respectively. For Cryptosporidium spp., DNA sequence analysis indicated that all 23 positive samples were identified as C. andersoni. Furthermore, five known subtypes (ST1, ST10, ST14, ST21 and ST26) and three unknown subtypes of Blastocystis sp. were detected among 103 positive samples using DNA sequence analysis. This study reported the occurrence and prevalence of Cryptosporidium spp. and Blastocystis sp. in cattle in Shanxi Province for the first time, which extends the geographical distribution of these two zoonotic parasites and provides baseline data for the prevention and control of these two important zoonotic parasites in cattle in Shanxi Province.
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Affiliation(s)
- Yao Liang
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Ya-Ya Liu
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Jin-Jin Mei
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Wen-Bin Zheng
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Qing Liu
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Wen-Wei Gao
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Xing-Quan Zhu
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
- Research Center for Parasites & Vectors, College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
- Key Laboratory of Veterinary Public Health of Higher Education of Yunnan Province, College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Shi-Chen Xie
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Jinzhong 030801, China; (Y.L.); (Y.-Y.L.); (J.-J.M.); (W.-B.Z.); (Q.L.); (W.-W.G.)
- Research Center for Parasites & Vectors, College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
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Wei CN, Qin RL, Zhang ZH, Zheng WB, Liu Q, Gao WW, Zhu XQ, Xie SC. Prevalence and Genetic Characterization of Blastocystis in Sheep and Pigs in Shanxi Province, North China: From a Public Health Perspective. Animals (Basel) 2023; 13:2843. [PMID: 37760242 PMCID: PMC10525586 DOI: 10.3390/ani13182843] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2023] [Revised: 09/01/2023] [Accepted: 09/03/2023] [Indexed: 09/29/2023] Open
Abstract
Blastocystis is a common zoonotic intestinal protozoan and causes a series of gastrointestinal symptoms in humans and animals via the fecal-oral route, causing economic losses and posing public health problems. At present, the prevalence and genetic structure of Blastocystis in sheep and pigs in Shanxi province remains unknown. Thus, the present study collected 492 sheep fecal samples and 362 pig fecal samples from three representative counties in northern, central and southern Shanxi province for the detection of Blastocystis based on its SSU rRNA gene. The results showed that the overall prevalence of Blastocystis in the examined sheep and pigs were 16.26% and 14.09%, respectively. Sequences analyses showed that four known subtypes (ST5, ST10, ST14 and ST30) in sheep and two subtypes (ST1 and ST5) in pigs were detected in this study, with ST5 being the predominate subtype among the study areas. Phylogenetic analysis showed that the same subtypes were clustered into the same branch. This study reveals that sheep and pigs in Shanxi province are hosts for multiple Blastocystis subtypes, including the zoonotic subtypes (ST1 and ST5), posing a risk to public health. Baseline epidemiological data are provided that help in improving our understanding of the role of zoonotic subtypes in Blastocystis transmission.
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Affiliation(s)
- Chang-Ning Wei
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Rui-Lin Qin
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Zhen-Huan Zhang
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Wen-Bin Zheng
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Qing Liu
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Wen-Wei Gao
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
| | - Xing-Quan Zhu
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
- Key Laboratory of Veterinary Public Health of Higher Education of Yunnan Province, College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China
| | - Shi-Chen Xie
- Laboratory of Parasitic Diseases, College of Veterinary Medicine, Shanxi Agricultural University, Jinzhong 030801, China; (C.-N.W.); (R.-L.Q.); (Z.-H.Z.); (W.-B.Z.); (Q.L.); (W.-W.G.)
- Research Center for Parasites & Vectors, College of Veterinary Medicine, Hunan Agricultural University, Changsha 410128, China
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Wang P, Li S, Zou Y, Han RY, Wang P, Song DP, Wang CB, Chen XQ. Molecular Characterization of Entamoeba spp. in Pigs with Diarrhea in Southern China. Animals (Basel) 2022; 12:ani12141764. [PMID: 35883310 PMCID: PMC9311668 DOI: 10.3390/ani12141764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2022] [Revised: 07/04/2022] [Accepted: 07/07/2022] [Indexed: 11/16/2022] Open
Abstract
Entamoeba spp. is a common zoonotic intestinal protozoan that can parasitize most vertebrates, including humans and pigs, causing severe intestinal diseases and posing a serious threat to public health. However, the available data on Entamoeba spp. infection in pigs are relatively limited in China. To characterize the infection of Entamoeba spp. within pigs in southern China, 1254 fecal samples of diarrheic pigs were collected from 37 intensive pig farms in Hunan, Jiangxi and Fujian provinces and the infection of Entamoeba spp. was investigated based on the small subunit rRNA (SSU rRNA) gene. The overall infection rate of Entamoeba spp. was 58.4% (732/1254), including 38.4% (118/307) in suckling piglets, 51.2% (153/299) in weaned piglets, 57.9% (55/95) in fattening pigs and 73.4% (406/553) in sows, respectively. Moreover, age and the sampling cities in Jiangxi and Fujian provinces were found to be the key factors influencing the infection of Entamoeba spp. (p < 0.05). Two subtypes (ST1 and ST3) with a zoonotic potential of Entamoeba polecki and Entamoeba suis were detected in all age groups of pigs and all sampling areas, with the predominant species and predominant subtype being E. polecki (91.3%, 668/732) and E. polecki ST1 (573/668), respectively, and E. polecki ST1 + E. polecki ST3 (78.6%, 239/304) being the most frequently detected form of mixed infection. Severe Entamoeba spp. infection and zoonotic subtypes were found in this study, exposing a large public health problem in the study area, and strategies need to be implemented to eliminate the risk in the future.
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Affiliation(s)
- Pei Wang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;
| | - Sen Li
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;
| | - Yang Zou
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;
| | - Ru-Yi Han
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
| | - Ping Wang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
| | - De-Ping Song
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
| | - Cheng-Bin Wang
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
| | - Xiao-Qing Chen
- College of Animal Science and Technology, Jiangxi Agricultural University, Nanchang 330045, China; (P.W.); (S.L.); (R.-Y.H.); (P.W.); (D.-P.S.); (C.-B.W.)
- State Key Laboratory of Veterinary Etiological Biology, Key Laboratory of Veterinary Parasitology of Gansu Province, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou 730046, China;
- Correspondence:
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