• Title, Summary, Keyword: porcine reproductive and respiratory syndrome virus

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Characterization of Interaction Between Porcine Reproductive and Respiratory Syndrome Virus and Porcine Dendritic Cells

  • Park, Jie-Yeun;Kim, Hyun-Soo;Seo, Sang-Heui
    • Journal of Microbiology and Biotechnology
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    • v.18 no.10
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    • pp.1709-1716
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    • 2008
  • The porcine reproductive and respiratory syndrome Virus (PRRSV) is an infectious disease that causes abortions and respiratory disorders in swine. In this study, the interaction between PRRSV and porcine dendritic cells generated from $CD14^{+}$ monocytes in the presence of GM-CSF and IL-4 was examined. As a result, it was shown that immature and mature dendritic cells can be productively infected with PRRSV. When the expression of surface MHC molecules on infected dendritic cells was determined, MHC classes I and II were found to be downregulated when compared with un infected dendritic cells. With the exception of the IL-4 and IFN-$\gamma$ cytokines, the induction of the IL-10, IL-12, and TNF-$\alpha$ cytokines all increased in dendritic cells infected with PRRSV. A mixed lymphocyte reaction showed that peripheral blood mononuclear cells cocultured with PRRSV-infected dendritic cells were less stimulated than peripheral blood mononuclear cells cocultured with dendritic cells treated with PBS, LPS, or UV-inactivated PRRSV. Therefore, these results suggest that PRRSV would appear to modulate the immune stimulatory function of porcine dendritic cells.

Evaluation of the efficacy of an attenuated live vaccine based on virulent porcine reproductive and respiratory syndrome virus 2 in young pigs

  • Lee, Seung-Chul;Noh, Yun-Hee;Lee, Sunhee;Choi, Hwan-Won;Yoon, In-Joong;Kang, Shien-Young;Lee, Changhee
    • Korean Journal of Veterinary Research
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    • v.58 no.3
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    • pp.137-141
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    • 2018
  • The efficacy of the CA-2-MP120 vaccine, a cell culture-attenuated strain of virulent porcine reproductive and respiratory syndrome virus (PRRSV), was assessed in pigs. Despite the persistence of viremia in all vaccinated animals during the immunization period, the virus was not detected in vaccinated pigs following challenge. Furthermore, no pigs in the vaccinated group shed PRRSV nasally, orally or rectally throughout the experiment. Moreover, histopathological lung and lymph node lesions in the immunized group were much milder than those in the unimmunized and challenged group. These results indicated that CA-2-MP120 can provide effective protection against virulent wild-type PRRSV-2.

Expression of porcine reproductive and respiratory syndrome virus (PRRSV) ORF7 gene and monoclonal antibody production (돼지생식기호흡기증후군바이러스 ORF7 유전자 발현 및 단크론항체 생산)

  • Lee, Seung-Chul;Park, Ga-Hye;Lee, Kyeong-Won;Ryu, Min-Sang;Kang, Shien-Young
    • Korean Journal of Veterinary Service
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    • v.37 no.3
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    • pp.143-150
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    • 2014
  • Porcine reproductive and respiratory syndrome virus (PRRSV) is the etiological agent of PRRS characterized by reproductive losses in sows and respiratory disorders in piglets. The PRRSV is a small enveloped virus containing a positive-sense, single-stranded RNA genome and divided into two genotype, type 1 (European) and type 2 (North American), respectively, by nucleotide identity. In this study, ORF7 gene of the type 1 and type 2 PRRSV was cloned and expressed in Baculovirus expression system. Also, monoclonal antibodies (MAbs) against ORF7 were produced and characterized. The expressed ORF7 proteins in the recombinant virus were confirmed by indirect fluorescence antibody (IFA) test using His6 and PRRSV-specific antiserum. A total of eight MAbs were produced and characterized. One (3G12) MAb was type 1 PRRSV ORF7-specific and two (6B10 and 16H8) were type 2 PRRSV ORF7-specific. Other five (1A1, 2A4, 4B4, 12C4 and 13F11) MAbs reacted with both type 1 and type 2 PRRSV. Some PRRSV ORF7-specific MAbs recognized the porcine tissues infected with PRRSV by IFA or immunohistochemistry (IHC) assay. From this experiment, it was confirmed that MAbs produced in this study were PRRSV ORF7-specific and could be used as reliable reagents for type 1/type 2 PRRSV detection.

Detection of viral pathogens and isolation of porcine circovirus 2 from postweaning multisystemic wasting syndrome-affected piglets (이유자돈 전신소모성증후군 이환 자돈에서의 바이러스성 원인체 검색 및 porcine circovirus 2 분리동정)

  • Park, Choi-Kyu;Kim, Hyun-Soo
    • Korean Journal of Veterinary Research
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    • v.44 no.4
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    • pp.561-569
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    • 2004
  • To detect viral agents and isolate porcine circovirus 2 (PCV2), 60 samples of lung and lymph node were collected from 5 to 12 week-old pigs that had showed clinical signs of postweaning multisystemic wasting syndrome (PMWS). Polymerase chain reactions (PCRs) were conducted to identify the viral pathogens including PCV1, PCV2, porcine parvovirus (PPV) and porcine reproductive and respiratory syndrome virus (PRRSV) that have been considered to be the causal agents of PMWS. Among 60 samples, PCV 2 was detected from 57 samples but no PCV 1 was detected. PRRSV and/or PPV were also detected from 27 (47.4%) samples and 1 (1.8%) sample of these 57 PCV 2-positive samples, respectively. Tissue homogenates were inoculated onto PCV-free PK-15 cell monolayers. Seven isolates were confirmed as PCV 2 by multiplex PCR, indirect immunofluorescence assay, and transmissible electron microscopy. These date suggest that PRRSV is a major cofactors causing PMWS in pigs that were infected with PCV2 in Korea.

Pathologic Studies in Piglets Naturally Infected with Porcine Reproductive and Respiratory Syndrome Virus (돼지 생식기 호흡기 증후군 바이러스 자연감염 예의 병리학적 연구)

  • Kim, Jae-Hoon;Hwang, Eui-Kyung;Kim, Yong-Joo;Sohn, Hyun-Joo
    • Korean Journal of Veterinary Pathology
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    • v.1 no.2
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    • pp.125-134
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    • 1997
  • Porcine Reproductive and Respiratory Syndrome Virus infection (PRRSV) was confirmed by serology histopathology immunohistochemistry and bacteriologic examination in young pigs. Four suckling and six weaned piglets submitted from three different farms showed coughing sneezing labored rapid abdominal respiration lethargy and anorexia. Grossly apical and cardiac lung lobes appeared mottled with pale to dark tan discoloration. Submandibular and bronchial lymph nodes were tan and enlarged. All piglets were seropositive for PRRSV antibodies by the indirect immunofluorescent antibody(IFA) test. Microscopically lung lesions were characterized by hyperplasia and hypertrophy of type 2 pneumocytes infiltration of mononuclear cells in alveolar intersitium accumulation of necrotic debris in alveolar spaces accompanied by proliferation of alveolar multinucleated syncytial cells. Using immunohistochemical technique PRRSV antigens were demonstrated in alveolar macrophages and type 2 pneumocytes in histologic lung tissue sections. Also PRRSV antigens were detected in brain lymph nodes spleen and heart. Additionally piglets showed nonsuppurative meningoencephalitis mandibular necrotic lymphadenopathy splenic atrophy and myocardial necrosis.

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Detection of antibody to porcine reproductive and respiratory syndrome virus from pig sera collected during the period of January to December 2000

  • Jung, Hae-Sun;Kim, Su-Mi;Kim, Jong-Taik;Han, Tae-Uk;Kang, Shien-Young;Shin, Kwang-Soon;Kim, Chul-Joong;Park, Bae-Keun;Kim, Hyun-Soo
    • Korean Journal of Veterinary Service
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    • v.24 no.4
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    • pp.343-346
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    • 2001
  • During the period of January to December 2000, a total of 3,505 swine sera was collected from 208 farms, which are located throughout country, for the diagnosis of porcine reproductive and respiratory syndrome(PRRS). The antibody to porcine reproductive and respiratory syndrome virus(PRRS) was tested by indirect immunofluorescent antibody(IFA) test. Of 208 farms tested, at least one or more than one pigs was positive for PRRSV antibody in 188(90.4%) farms. The overall seroprevalence of PRRSV antibody was 45.1% (1581/3505). Most pigs were infected with PRRSV at around 50- to 60-day old. The seroprevalence of antibody varied with age. The highest seroprevalence of PRRSV antibody was observed in the growing pigs at around 80-day old. About one-thirds of adult pigs including boar, gilt and sow were positive to PRRSV antibody. In many farms, the infection of PRRSV was chronic and confined to grower and/or finisher. However, antibody was detected from all production phase in some farms.

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Pathogenic effects of porcine reproductive and respiratory syndrome virus isolates in swine tracheal ring culture

  • Park, Bong-kyun;Collins, James E.;Goyal, Sagar M.;Pijoan, Carlos;Joo, Han-soo
    • Korean Journal of Veterinary Research
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    • v.39 no.2
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    • pp.311-317
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    • 1999
  • Pathogenic effects of 29 different porcine reproductive and respiratory syndrome(PRRS) virus isolates were investigated in swine tracheal ring(STR) cultures by examining their effects on the ciliary activity of STR. Inhibition of ciliary movement and destruction of the tracheal epithelium were seen between 72 and 96 hours postinoculation(PI). Virus replication was demonstrated by examining viral infectivity of the supernatants from the STR cultures. PRRS virus antigen in macrophages was detected by a streptavidin-biotin complex(ABC) immunoperoxidase method. Of the 29 PRRS virus isolates, 8 isolates were classified into pathogenic, and the remaining 21 isolates were determined as mildly pathogenic or apathogenic viruses. These results suggest that STR examination may be used as a method for predicting pathogenic variability of PRRS virus isolates.

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Pathologic studies in lymph nodes of pigs infected with porcine circovirus type 2, porcine reproductive and respiratory syndrome virus (돼지 써코바이러스 2형과 돼지 생식기 호흡기 증후군 바이러스 감염에 따른 림프절 병변에 대한 병리학적 연구)

  • Jung, Ji-Youl;Kim, Jae-Hoon
    • Korean Journal of Veterinary Research
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    • v.53 no.4
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    • pp.245-251
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    • 2013
  • Porcine circovirus type 2 (PCV2) and porcine reproductive and respiratory syndrome virus (PRRSV) have been suspected to have immunosuppressive effects on pigs. To investigate the correlation between these virus infection and the lesions of lymph nodes including sub-mandibular and inguinal lymph node, 44 pigs (PCV2 single, n = 14; PRRSV single, n = 10; PCV2/PRRSV, n = 14; negative control, n = 6) were examined by histopathology and immunohistochemistry. Histopathologically, granulomatous lymphadenitis characterized by lymphoid depletion with histiocytic cells infiltration was observed in PCV-2 single and PCV-2/PRRSV group. Immunohistochemically, there were significant reduction of B and T lymphocytes in lymph nodes of these groups, while the number of macrophages was increased. In only PRRSV infected group, germinal center hypertrophy and lymphoid necrosis were observed. Immunohistochemically, the number of CD3+ T lymphocytes was slightly increased. Severe lymphocytic depletion in PCV-2 infection-related lymph nodes might be associated with producing immunocompromised state in pig. Comparing with PCV-2 infected group, PRRSV produced minor effects on the changes in immune cell population in the lymph nodes of pigs. PRRSV may increase susceptibility of the disease in pigs by disruption of the first defense lines in target organs, such as the alveolar macrophages in lungs.

Biosecurity protocols for the prevention of spread of porcine reproductive and respiratory syndrome virus (PRRSV) (PRRS 전파방지를 위한 차단방역 프로토콜)

  • Jeong, Seong-Dae
    • Journal of the korean veterinary medical association
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    • v.46 no.3
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    • pp.279-287
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    • 2010
  • 돼지 번식기 및 호흡기 증후군 ( PRRS ; Porcine Reproductive and Respiratory Syndrome )은 우리나라를 포함한 전세계적으로 양돈산업에 가장 심각한 경제적인 손실을 끼치고 있는 질병으로, 조사자료에 의하면 미국의 경우 년간 손실 금액이 약 6천5백억(미화 560백만 달러)에 이르는 것으로 추정된다. 최근 우리나라도 피해의 정도가 정확히 조사 된 바가 없으나 현장의 골칫거리로 아직도 인식되어 다양한 시도 (Depop, Multi-site, Stabilization, etc)를 통해 사안별로 조치들을 하지만 발생정도는 줄어들지 않고 있다. 따라서 최근 차단방역에 대한 미국의 자료를 소개하오니 양돈현장 수의사들에게 도움이 되었으면 한다.

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Porcine ear necrosis syndrome by coinfection of porcine reproductive and respiratory syndrome virus and Staphylococcus hyicus (PRRSV와 Staphylococcus hyicus 복합감염에 의한 돼지 귀 괴사 증후군 증례 보고)

  • Lee, Seunghee;Jung, Ji-Youl;Kim, Seong-Hee;Kim, Jong-Wan;Park, Jung-Won;Kang, Dae-Young;Her, Ji-Woong;Jeong, Yea-Ji;So, Byung Jae;Yoon, Soon-Seek
    • Korean Journal of Veterinary Research
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    • v.57 no.2
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    • pp.143-146
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    • 2017
  • Porcine ear necrosis syndrome is characterized by erosive and ulcerative lesions at the margin or tip of the pinna. Three growing pigs of different ages exhibited retarded growth accompanied by reddening and necrosis of ear prior to death. Gross examination showed reddening, swelling, black discoloration, scaling, and variable-sized yellowish materials and edema in ear cross section. Microscopically, thrombosis, abscess, ulceration, epidermal hyperplasia, and dermal pyogranulomatous inflammation with an intralesional bacterial colony were observed. Staphylococcus hyicus was isolated in all pigs' ears and porcine reproductive and respiratory syndrome virus was detected by PCR and immunohistochemistry.