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Pertich A, Barna Z, Makai O, Farkas J, Molnár T, Bálint Á, Szabó I, Albert M. Elimination of porcine reproductive and respiratory syndrome virus infection using an inactivated vaccine in combination with a roll-over method in a Hungarian large-scale pig herd. Acta Vet Scand 2022; 64:12. [PMID: 35525978 PMCID: PMC9077950 DOI: 10.1186/s13028-022-00630-5] [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: 10/24/2021] [Accepted: 04/19/2022] [Indexed: 11/11/2022] Open
Abstract
Background Porcine reproductive and respiratory syndrome virus (PRRSV) causes severe economic losses worldwide and only four countries in Europe are free from PRRSV. Complete depopulation–repopulation is the safest and fastest, but also the most expensive method for eradicating PRRSV from a population. Another possible way to eliminate an endemic PRRSV infection is to replace the infected breeding stock by gilts reared isolated and protected from PRRSV on an infected farm. With this method it is possible to maintain continuous production on the farm. The authors report the first successful elimination of PRRSV in a Hungarian large-scale pig farm by using an inactivated vaccine and performing segregated rearing of the offspring. Case presentation The study was performed on a PRRSV infected farm (Farm A) with 1475 sows. The clinical signs of reproductive failure had been eliminated previously by using an inactivated vaccine (Progressis®, Ceva). At the beginning of the elimination programme, gilts intended for breeding were vaccinated at 60 and 90–100 days of age. After that, gilts selected for breeding were vaccinated at 6 months of age, on the 60–70th day of pregnancy and at weaning. Approximately 1200 piglets from vaccinated sows were transported at 7 weeks of age to a closed, empty farm (Farm B) after being tested negative for PRRSV by a polymerase chain reaction (PCR) method, and then were reared here until 14 weeks of age. At this age, all pigs were tested by PRRS ELISA. Seronegative gilts (n = 901) were subsequently transported from Farm B to a third, closed and empty farm (Farm C), and (having reached the breeding age) they were inseminated here after a second negative serological test (ELISA). At the same time, Farm A was depopulated, cleaned and disinfected. All pregnant gilts were transported from Farm C to Farm A after being re-tested negative for antibodies against PRRSV. Follow-up serology tests were performed after farrowing and results yielded only seronegative animals. Based on the subsequent negative test results, the herd was declared PRRSV free by the competent authority. Conclusions The presented farm was the first during the National PRRS Eradication Programme of Hungary to eradicate PRRSV successfully by vaccinating the sows with an inactivated vaccine and performing segregated rearing of the offspring. Production was almost continuous during the whole process of population replacement.
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Choi HY, Kim MS, Kang YL, Choi JC, Choi IY, Jung SW, Jeong JY, Kim MC, Hwang SS, Lee SW, Park SY, Song CS, Choi IS, Lee JB. Development of a Chimeric Porcine Reproductive and Respiratory Syndrome Virus (PRRSV)-2 Vaccine Candidate Expressing Hypo-Glycosylated Glycoprotein-5 Ectodomain of Korean Lineage-1 Strain. Vet Sci 2022; 9:vetsci9040165. [PMID: 35448663 PMCID: PMC9028511 DOI: 10.3390/vetsci9040165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/20/2022] [Accepted: 03/26/2022] [Indexed: 11/24/2022] Open
Abstract
Vaccination is a practical method to provide protection against porcine reproductive and respiratory syndrome virus (PRRSV), but current PRRSV vaccines show limited efficacy against divergent field strains. Lineage 1 PRRSV includes virulent strains such as NADC30 and MN184 and now has become one of the most prevalent viruses in Korea. Accordingly, there is an urgent need to develop a new vaccine for Korean lineage-1 strains. In this study, a vaccine candidate against Korean lineage-1 PRRSV, vCSL1-GP5-N33D, was developed by reverse genetics technology. vCSL1-GP5-N33D was designed as a hypo-glycosylated chimeric virus containing the glycoprotein 5 ectodomain region of the Korean lineage-1 wild-type strain. An inactivated vaccine of vCSL1-GP5-N33D was applied to a PRRS-endemic farm and elicited high serum virus neutralization (SVN) antibody titers. The vaccinated group induced SVN antibody titers of 4.40 (log2) ± 2.46, which were approximately 2-fold higher than those of the negative control at 8-weeks post-vaccination. Moreover, 60% of pigs in the vaccinated group displayed SVN antibody titers of ≥5 (log2), while none of the pigs in the negative control exhibited SVN antibody titers of ≥5 (log2). The overall results of the animal experiment suggest that the vCSL1-GP5-N33D inactivated vaccine is a promising vaccine candidate.
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Affiliation(s)
- Hwi-Yeon Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - Min-Sik Kim
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - Yeong-Lim Kang
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - Jong-Chul Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - In-Yeong Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - Sung-Won Jung
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
| | - Ji-Yun Jeong
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- Careside Co. Ltd., Woolim Lions Valley A-B210, #146-8, Sangdaewon-dong, Jungwon-gu, Seongnam 13209, Gyeonggi-do, Korea;
| | - Min-Chul Kim
- Careside Co. Ltd., Woolim Lions Valley A-B210, #146-8, Sangdaewon-dong, Jungwon-gu, Seongnam 13209, Gyeonggi-do, Korea;
| | - Seong-Soo Hwang
- Samhwa Breedings Agri. Inc., 435, Sinjin-ri, Gwangcheon-eup, Hongseong-gun 35090, Chungcheongnam-do, Korea;
| | - Sang-Won Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- KU Research Center for Zoonosis, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
| | - Seung-Yong Park
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- KU Research Center for Zoonosis, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
| | - Chang-Seon Song
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- KU Research Center for Zoonosis, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
| | - In-Soo Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- KU Research Center for Zoonosis, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
| | - Joong-Bok Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea; (H.-Y.C.); (M.-S.K.); (Y.-L.K.); (J.-C.C.); (I.-Y.C.); (S.-W.J.); (J.-Y.J.); (S.-W.L.); (S.-Y.P.); (C.-S.S.); (I.-S.C.)
- KU Research Center for Zoonosis, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
- Correspondence:
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Choi HY, Lee SH, Ahn SH, Choi JC, Jeong JY, Lee BJ, Kang YL, Hwang SS, Lee JK, Lee SW, Park SY, Song CS, Choi IS, Lee JB. A chimeric porcine reproductive and respiratory syndrome virus (PRRSV)-2 vaccine is safe under international guidelines and effective both in experimental and field conditions. Res Vet Sci 2021; 135:143-152. [PMID: 33517163 DOI: 10.1016/j.rvsc.2021.01.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 01/11/2021] [Accepted: 01/21/2021] [Indexed: 12/12/2022]
Abstract
Vaccination is currently the most effective strategy to control porcine reproductive and respiratory syndrome (PRRS). New-generation PRRS vaccines are required to be safe and broadly cross-protective. We have recently created the chimeric PRRS virus K418DM which proved to be a good vaccine candidate under field conditions. In the present study, we designed safety and efficacy tests under experimental and field conditions for further evaluation of K418DM1.1, a plaque-purified K418DM. In the homologous challenge study, K418DM1.1 induced high serum virus neutralization (SVN) antibody titers (i.e., 4.2 log2 ± 1.7) at 21 days post-challenge (dpc) and provided protection as demonstrated by the significantly lower levels of viremia at 3 and 7 dpc and significantly lower microscopic lung lesion scores compared to the unvaccinated group. K418DM1.1 was also protective in the heterologous challenge study, with vaccinated pigs showing significantly lower levels of viremia at 14 dpc compared to the unvaccinated pigs. A field study was performed to evaluate the efficacy of K418DM1.1 against heterologous exposure and vaccinated pigs presented significantly lower viremia than unvaccinated pigs. According to the safety test for the examination of virulence reversion, no infectivity was observed in tissue homogenate filtrate both in the vaccinated and comingled groups. Thus, the risk of virulence, as well as transmission, appeared negligible. These overall results indicate that K418DM1.1 is a good vaccine candidate based on its safety and protective efficacy.
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Affiliation(s)
- Hwi-Yeon Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - So-Hyun Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - So-Hyeun Ahn
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Jong-Chul Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Ji-Yun Jeong
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Beom-Joo Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Yeong-Lim Kang
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Seong-Soo Hwang
- Samhwa Breedings Agri. Inc., 435, Sinjin-ri, Gwangcheon-eup, Hongseong-gun, Chungcheongnam-Do 350-900, Republic of Korea
| | - Jung-Keun Lee
- Department of Pathology and Population Medicine, College of Veterinary Medicine, Midwestern University, 19555, North 59th Avenue, Glendale, AZ 85308, USA
| | - Sang-Won Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Seung-Yong Park
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Chang-Seon Song
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - In-Soo Choi
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea
| | - Joong-Bok Lee
- Laboratory of Infectious Diseases, College of Veterinary Medicine, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Republic of Korea.
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