• Title, Summary, Keyword: porcine reproductive and respiratory syndrome(PRRS)

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An Integrated Epidemiological and Economic Analysis of Vaccination against Highly Pathogenic Porcine Reproductive and Respiratory Syndrome (PRRS) in Thua Thien Hue Province, Vietnam

  • Zhang, Haifeng;Kono, Hiroichi;Kubota, Satoko
    • Asian-Australasian Journal of Animal Sciences
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    • v.27 no.10
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    • pp.1499-1512
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    • 2014
  • The purposes of this study are to assess pig farmers' preference for highly pathogenic porcine reproductive and respiratory syndrome (PRRS) vaccine, and estimate the cost and benefit of PRRS vaccination in Vietnam. This study employed an integrated epidemiological and economic analysis which combined susceptible-infectious-recovered (SIR) model, choice experiment (CE) and cost-benefit analysis (CBA) together. The result of SIR model showed the basic reproduction number ($R_0$) of PRRS transmission in this study is 1.3, consequently, the optimal vaccination percentage is 26%. The results of CE in this study indicate that Vietnam pig farmers are showing a high preference for the PRRS vaccine. However, their mean willingness to pay is lower than the potential cost of PRRS vaccine. It can be considered to be one of the reasons that the PRRS vaccination ratio is still low in Vietnam. The results of CBA specified from the whole society's point of view (Social perspective), the benefits of PRRS vaccination are 2.3 to 4.5 times larger than the costs. To support policy making for increasing the PRRS vaccination proportion, this study indicates two ways to increase the vaccination proportion: i) decrease vaccine price by providing a subsidy, ii) provide compensation of culling only for PRRS vaccinated pigs.

Investigation of post - weaning atrophic pig diseases in swine breeding complex in Jeonbuk - Iksan (전북 익산 양돈단지 이유 후 위축자돈 질병 조사)

  • Chu, Keum-Suk;Jo, Young-Suk
    • Korean Journal of Veterinary Service
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    • v.30 no.1
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    • pp.85-93
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    • 2007
  • The purpose of this study was to investigate the infection situation of several diseases (post-weaning atrophic pigs) such as porcine reproductive and respiratory syndrome (PRRS) in swine breeding complex in Jeonbuk-Iksan. From February to October in 2006, a total of 28 swine samples (6-10 week old) were collected from 6 farms and examined by polymerase chain reaction(PCR) and clinical signs. In the rate of single infection, pneumonia was top (32.1%), followed by salmonellosis (14.2%)and Glasser's disease (10.7%) and double infection pneumonia/Glasser's disease (17.8%) was detected. PCR was detected of PCV 2 from 28 (100.0%) and PPV 6 (21.4%), PRRS PORF6 10 (35.7%) and POR7 11 (39.2%), but HC and AD was not detected. The results suggest that PCV 2 is complex infection PRRS, PPV and bacterial disease.

Seroprevalence of porcine reproductive and respiratory syndrome (PRRS) and porcine circovirus-2 (PCV-2) in pig farms in Gyeongbuk province (경북지역 양돈장의 돼지생식기호흡기증후군, 돼지써코바이러스-2 항체가 조사)

  • Sohn, Jun-Hyung;Shin, Sung-Ho;Kim, Soon-Tae;Lee, Sung-sam;Yun, Mun-Jo;Cho, Gil-Jae
    • Korean Journal of Veterinary Service
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    • v.38 no.3
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    • pp.163-166
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    • 2015
  • The purpose of this study was to survey seroprevalence of porcine reproductive and respiratory syndrome (PRRS) virus and porcine circovirus-2 (PCV-2) in Gyeongbuk province by enzyme-linked immunosorbent assay (ELISA). A total of 966 samples collected from 21 pig farms were tested. The sero-positive rate of PRRS and PCV-2 were 77.6% (750/966) and 76.4% (738/966), respectively.

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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Current situation of porcine reproductive and respiratory syndrome in Korea (한국의 돼지생식기호흡기증후군(PRRS) 발생경향)

  • Han, Kyung-soo;Lyoo, Kwang-soo;Park, Bong-kyun
    • Korean Journal of Veterinary Research
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    • v.39 no.1
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    • pp.133-137
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    • 1999
  • The 2,078 blood samples from 148 swine farms were collected and tested by IFA for porcine reproductive and respiratory syndrome(PRRS) virus antibody to know what type of PRRS prevails by the area. Clinically reproductive form of PRRS occurred in swine farms of 3/27, 3/87, and 2/34 in eastern, central and western areas, but the seroprevalence of those areas was different as 6.5%, 23.3%, and 17.6%, respectively. However, respiratory form of PRRS occurred more frequently, and the number of farms manifested with the respiratory form of PRRS in the eastern, central and western areas was 22/27, 71/87, and 30/34, respectively. The seroprevalence of that form of PRRS in the eastern, central and western areas was 52.2%, 67.1%, and 51.6%, respectively. Subsequently mixed form of PRRS occurred more frequently in the central area and the number of farms of eastern, central and western areas was 2/27, 13/87, and 2/34, respectively. The PRRS seroprevalence of the eastern, central and western areas was 58.6%, 54.0%, and 19.2%, respectively. Collectively the PRRS seroprevalence of eastern, central and western areas was 43.8%, 59.3%, and 38.2%, respectively. Overall seroprevalence of PRRS in Korea was 51.8%. In conclusion, the reproductive or the respiratory form of PRRS has been still in trouble in the Korean swine industry and PRRS control measures have to be taken in consideration.

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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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Seroprevalence of antiboby to porcine reproductive and respiratory syndrome virus from pig sera collected from breeding herds (번식돈에서 돼지 생식기 호흡기증 바이러스 항체 분포 조사)

  • 박최규;김현수
    • Korean Journal of Veterinary Service
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    • v.27 no.1
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    • pp.89-94
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    • 2004
  • Total 2,451 sera collected from pig farms nationwide were tested for the detection of porcine reproductive and respiratory syndrome(PRRS) virus antibodies. The results were analyzed between different geographic regions, types of breeding pigs, and different years. The overall seroprevalence of PRRS virus antibodies for 3 years was 32.4%(705/2,451). The seroprevalence of PRRS virus antibodies in years 2000, 2001, 2002, and 2004 was 33.4% (284/850), 38.6%(291/754), 33.3%(155/466), and 17.1%(65/381), respectively. The seropevalence of PRRS virus antibody in sow in years 2000, 2001, 2002 and 2003 was 31.7%, 28.4%, 29.6%, and 13.4%, respectively. The seropevalence of PRRS virus antibody in gilts in years 2000, 2001, 2002 and 2003 was 36.6%, 67.4%, 54.7%, and 33.9%, respectively. The seropevalence of PRRS virus antibody in boars in years 2000, 2001 and 2003 was 45.7%, 36.4%, and 100%, respectively. No boar serum sample was submitted for the diagnosis of PRRS virus antibody in the year 2000. High seroprevalence of the PRRS virus antibody in sow, gilts and boars indicates that the infected breeding pigs are the major source of the PRRS virus infection, and also play an important role in spreading the PRRS virus between fan mates or herds.

Detection of antibody to porcine reproductive and respiratory syndrome virus from pig sera collected from pig farms (야외농장으로부터 수집된 돼지혈청가검물에서 돼지생식기 호흡기증 바이러스 항체 검사)

  • 김현수;공신국
    • Korean Journal of Veterinary Service
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    • v.22 no.4
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    • pp.371-375
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    • 1999
  • Total 1,434 sera collected from 72 pig farms were tested for the detection of porcine reproductive and respiratory syndrome (PRRS) virus antibodies. The overall seroprevalence of PRRS virus antibodies was 49.3% (707/727). Of 72 farms tested 59 (81.9%) farms had at least one or more than one pigs with PRRS virus antibodies. The seroprevalence of PRRS virus antibody varied with age. Seroprevalence of PRRS virus antibody in 1 to 30-day-old, 31 to 40-day-old, 41 to 50-day-old, 51 to 60-day-old, and over 61-day-old pig were 27.4%, 52.3%, 57.9%, 52.7%, and 68.2%, respectively. Gilt showed relatively higher seroprevalence (61.2%) than sow (29.2%) and boar (38.3%). In most farms, the infection of PRRS virus was chronic and confined to grower or finisher. This pattern of infection suggests that partial depopulation of the infected herds appears be one of the measures to eradicate the PRRS virus infection. High seroprevalence of the PRRS virus antibody in gilts and boars indicates that the infected gilts and boars in the breeding farms are the major source of the PRRS virus infection, and also play an important role in spreading the PRRS virus between fan mates or herds.

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