Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations
Japanese encephalitis (JE) is the largest worldwide cause of infectious encephalitis in humans and is caused by a mosquito‐borne flavivirus. JE transmission cycle involves Culex mosquitoes, pigs and aquatic birds as principal vertebrate amplifying hosts. JE infection is responsible for reproductive disorder in pigs when occurring after sexual maturity. In tropical areas, JE is endemic and the majority of pigs get infected before the age of 6 months. However, in subtropical areas, pigs may be infected after sexual maturity and thus experience clinical signs, inducing economic loss. The study aimed at better characterizing the influence of seasonal temperature variations (through estimates of degree days, DD) on JE circulation in pigs in subtropical area and inferring on the potential impact on JE symptomatic infection in reproductive pigs. Six hundred and forty‐one pig's sera sampled in northern Vietnam were analysed for Japanese encephalitis virus (JEV) by pan‐flavivirus ELISA. A subset of 108 ELISA‐positive samples, representative of each sampling occasion, were confirmed by JEV neutralization test compared with West Nile virus neutralization test. We modelled the seroprevalence of pigs according to a DD variable using a generalized additive model. We then predicted the age of infection in pigs according to their month of birth, using averaged temperature data over 10 years. The model predicts that only 80 percentage of pigs born between July and September will be protected against JEV when reaching sexual maturity contrary to the rest of the year when almost all pigs will seroconvert before sexual maturity. In subtropical area such as northern Vietnam, pigs could thus show symptomatic infection due to JE, and consequently reproductive disorders. Vaccination of future breeder pigs in epidemic areas could avoid the occurrence of JE‐associated reproductive disorders.
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dig-cirad-fr-5878062022-07-27T16:01:09Z http://agritrop.cirad.fr/587806/ http://agritrop.cirad.fr/587806/ Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations. Ruget Anne-Sophie, Beck Cécile, Gabassi A., Trévennec Karen, Lecollinet Sylvie, Chevalier Véronique, Cappelle Julien. 2018. Transboundary and Emerging Diseases, 65 (6) : 1485-1492.https://doi.org/10.1111/tbed.12885 <https://doi.org/10.1111/tbed.12885> Researchers Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations Ruget, Anne-Sophie Beck, Cécile Gabassi, A. Trévennec, Karen Lecollinet, Sylvie Chevalier, Véronique Cappelle, Julien eng 2018 Transboundary and Emerging Diseases L73 - Maladies des animaux Viet Nam http://aims.fao.org/aos/agrovoc/c_8227 Japanese encephalitis (JE) is the largest worldwide cause of infectious encephalitis in humans and is caused by a mosquito‐borne flavivirus. JE transmission cycle involves Culex mosquitoes, pigs and aquatic birds as principal vertebrate amplifying hosts. JE infection is responsible for reproductive disorder in pigs when occurring after sexual maturity. In tropical areas, JE is endemic and the majority of pigs get infected before the age of 6 months. However, in subtropical areas, pigs may be infected after sexual maturity and thus experience clinical signs, inducing economic loss. The study aimed at better characterizing the influence of seasonal temperature variations (through estimates of degree days, DD) on JE circulation in pigs in subtropical area and inferring on the potential impact on JE symptomatic infection in reproductive pigs. Six hundred and forty‐one pig's sera sampled in northern Vietnam were analysed for Japanese encephalitis virus (JEV) by pan‐flavivirus ELISA. A subset of 108 ELISA‐positive samples, representative of each sampling occasion, were confirmed by JEV neutralization test compared with West Nile virus neutralization test. We modelled the seroprevalence of pigs according to a DD variable using a generalized additive model. We then predicted the age of infection in pigs according to their month of birth, using averaged temperature data over 10 years. The model predicts that only 80 percentage of pigs born between July and September will be protected against JEV when reaching sexual maturity contrary to the rest of the year when almost all pigs will seroconvert before sexual maturity. In subtropical area such as northern Vietnam, pigs could thus show symptomatic infection due to JE, and consequently reproductive disorders. Vaccination of future breeder pigs in epidemic areas could avoid the occurrence of JE‐associated reproductive disorders. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/587806/7/Ruget_et_al-2018-Transboundary_and_Emerging_Diseases.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1111/tbed.12885 10.1111/tbed.12885 info:eu-repo/semantics/altIdentifier/doi/10.1111/tbed.12885 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1111/tbed.12885 |
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L73 - Maladies des animaux http://aims.fao.org/aos/agrovoc/c_8227 L73 - Maladies des animaux http://aims.fao.org/aos/agrovoc/c_8227 |
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L73 - Maladies des animaux http://aims.fao.org/aos/agrovoc/c_8227 L73 - Maladies des animaux http://aims.fao.org/aos/agrovoc/c_8227 Ruget, Anne-Sophie Beck, Cécile Gabassi, A. Trévennec, Karen Lecollinet, Sylvie Chevalier, Véronique Cappelle, Julien Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
description |
Japanese encephalitis (JE) is the largest worldwide cause of infectious encephalitis in humans and is caused by a mosquito‐borne flavivirus. JE transmission cycle involves Culex mosquitoes, pigs and aquatic birds as principal vertebrate amplifying hosts. JE infection is responsible for reproductive disorder in pigs when occurring after sexual maturity. In tropical areas, JE is endemic and the majority of pigs get infected before the age of 6 months. However, in subtropical areas, pigs may be infected after sexual maturity and thus experience clinical signs, inducing economic loss. The study aimed at better characterizing the influence of seasonal temperature variations (through estimates of degree days, DD) on JE circulation in pigs in subtropical area and inferring on the potential impact on JE symptomatic infection in reproductive pigs. Six hundred and forty‐one pig's sera sampled in northern Vietnam were analysed for Japanese encephalitis virus (JEV) by pan‐flavivirus ELISA. A subset of 108 ELISA‐positive samples, representative of each sampling occasion, were confirmed by JEV neutralization test compared with West Nile virus neutralization test. We modelled the seroprevalence of pigs according to a DD variable using a generalized additive model. We then predicted the age of infection in pigs according to their month of birth, using averaged temperature data over 10 years. The model predicts that only 80 percentage of pigs born between July and September will be protected against JEV when reaching sexual maturity contrary to the rest of the year when almost all pigs will seroconvert before sexual maturity. In subtropical area such as northern Vietnam, pigs could thus show symptomatic infection due to JE, and consequently reproductive disorders. Vaccination of future breeder pigs in epidemic areas could avoid the occurrence of JE‐associated reproductive disorders. |
format |
article |
topic_facet |
L73 - Maladies des animaux http://aims.fao.org/aos/agrovoc/c_8227 |
author |
Ruget, Anne-Sophie Beck, Cécile Gabassi, A. Trévennec, Karen Lecollinet, Sylvie Chevalier, Véronique Cappelle, Julien |
author_facet |
Ruget, Anne-Sophie Beck, Cécile Gabassi, A. Trévennec, Karen Lecollinet, Sylvie Chevalier, Véronique Cappelle, Julien |
author_sort |
Ruget, Anne-Sophie |
title |
Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
title_short |
Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
title_full |
Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
title_fullStr |
Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
title_full_unstemmed |
Japanese encephalitis circulation pattern in swine of northern Vietnam and consequences for swine's vaccination recommendations |
title_sort |
japanese encephalitis circulation pattern in swine of northern vietnam and consequences for swine's vaccination recommendations |
url |
http://agritrop.cirad.fr/587806/ http://agritrop.cirad.fr/587806/7/Ruget_et_al-2018-Transboundary_and_Emerging_Diseases.pdf |
work_keys_str_mv |
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1758025728795869184 |