Mapping the serological prevalence rate of west Nile fever in equids, Tunisia
West Nile fever (WNF) is a viral disease of wild birds transmitted by mosquitoes. Humans and equids can also be affected and suffer from meningoencephalitis. In Tunisia, two outbreaks of WNF occurred in humans in 1997 and 2003; sporadic cases were reported on several other years. Small-scale serological surveys revealed the presence of antibodies against WN virus (WNV) in equid sera. However, clinical cases were never reported in equids, although their population is abundant in Tunisia. This study was achieved to characterize the nationwide serological status of WNV in Tunisian equids. In total, 1189 sera were collected in 2009 during a cross-sectional survey. Sera were tested for IgG antibodies, using ELISA and microneutralization tests. The estimated overall seroprevalence rate was 28%, 95% confidence interval [22; 34]. The highest rates were observed (i) in the north-eastern governorates (Jendouba, 74%), (ii) on the eastern coast (Monastir, 64%) and (iii) in the lowlands of Chott El Jerid and Chott el Gharsa (Kebili, 58%; Tozeur, 52%). Environmental risk factors were assessed, including various indicators of wetlands, wild avifauna, night temperature and chlorophyllous activity (normalized difference vegetation index: NDVI). Multimodel inference showed that lower distance to ornithological sites and wetlands, lower night-time temperature, and higher NDVI in late spring and late fall were associated with higher serological prevalence rate. The model-predicted nationwide map of WNF seroprevalence rate in Tunisian equids highlighted different areas with high seroprevalence probability. These findings are discussed in the perspective of implementing a better WNF surveillance system in Tunisia. This system might rely on (i) a longitudinal survey of sentinel birds in high-risk areas and time periods for WNV transmission, (ii) investigations of bird die-offs and (iii) syndromic surveillance of equine meningoencephalitis.
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L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 http://aims.fao.org/aos/agrovoc/c_8007 L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 http://aims.fao.org/aos/agrovoc/c_8007 |
spellingShingle |
L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 http://aims.fao.org/aos/agrovoc/c_8007 L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 http://aims.fao.org/aos/agrovoc/c_8007 Bargaoui, Ramzi Lecollinet, Sylvie Lancelot, Renaud Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
description |
West Nile fever (WNF) is a viral disease of wild birds transmitted by mosquitoes. Humans and equids can also be affected and suffer from meningoencephalitis. In Tunisia, two outbreaks of WNF occurred in humans in 1997 and 2003; sporadic cases were reported on several other years. Small-scale serological surveys revealed the presence of antibodies against WN virus (WNV) in equid sera. However, clinical cases were never reported in equids, although their population is abundant in Tunisia. This study was achieved to characterize the nationwide serological status of WNV in Tunisian equids. In total, 1189 sera were collected in 2009 during a cross-sectional survey. Sera were tested for IgG antibodies, using ELISA and microneutralization tests. The estimated overall seroprevalence rate was 28%, 95% confidence interval [22; 34]. The highest rates were observed (i) in the north-eastern governorates (Jendouba, 74%), (ii) on the eastern coast (Monastir, 64%) and (iii) in the lowlands of Chott El Jerid and Chott el Gharsa (Kebili, 58%; Tozeur, 52%). Environmental risk factors were assessed, including various indicators of wetlands, wild avifauna, night temperature and chlorophyllous activity (normalized difference vegetation index: NDVI). Multimodel inference showed that lower distance to ornithological sites and wetlands, lower night-time temperature, and higher NDVI in late spring and late fall were associated with higher serological prevalence rate. The model-predicted nationwide map of WNF seroprevalence rate in Tunisian equids highlighted different areas with high seroprevalence probability. These findings are discussed in the perspective of implementing a better WNF surveillance system in Tunisia. This system might rely on (i) a longitudinal survey of sentinel birds in high-risk areas and time periods for WNV transmission, (ii) investigations of bird die-offs and (iii) syndromic surveillance of equine meningoencephalitis. |
format |
article |
topic_facet |
L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 http://aims.fao.org/aos/agrovoc/c_8007 |
author |
Bargaoui, Ramzi Lecollinet, Sylvie Lancelot, Renaud |
author_facet |
Bargaoui, Ramzi Lecollinet, Sylvie Lancelot, Renaud |
author_sort |
Bargaoui, Ramzi |
title |
Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
title_short |
Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
title_full |
Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
title_fullStr |
Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
title_full_unstemmed |
Mapping the serological prevalence rate of west Nile fever in equids, Tunisia |
title_sort |
mapping the serological prevalence rate of west nile fever in equids, tunisia |
url |
http://agritrop.cirad.fr/575098/ http://agritrop.cirad.fr/575098/1/document_575098.pdf |
work_keys_str_mv |
AT bargaouiramzi mappingtheserologicalprevalencerateofwestnilefeverinequidstunisia AT lecollinetsylvie mappingtheserologicalprevalencerateofwestnilefeverinequidstunisia AT lancelotrenaud mappingtheserologicalprevalencerateofwestnilefeverinequidstunisia |
_version_ |
1792498756561666048 |
spelling |
dig-cirad-fr-5750982024-01-28T22:27:36Z http://agritrop.cirad.fr/575098/ http://agritrop.cirad.fr/575098/ Mapping the serological prevalence rate of west Nile fever in equids, Tunisia. Bargaoui Ramzi, Lecollinet Sylvie, Lancelot Renaud. 2015. Transboundary and Emerging Diseases, 62 (1) : 55-66.https://doi.org/10.1111/tbed.12077 <https://doi.org/10.1111/tbed.12077> Mapping the serological prevalence rate of west Nile fever in equids, Tunisia Bargaoui, Ramzi Lecollinet, Sylvie Lancelot, Renaud eng 2015 Transboundary and Emerging Diseases L73 - Maladies des animaux U30 - Méthodes de recherche Equidae fièvre flavivirus surveillance épidémiologique morbidité analyse du risque gestion du risque facteur de risque facteur du milieu Enquête pathologique distribution géographique cartographie sérologie technique immunologique Test ELISA organisme indicateur oiseau animal sauvage http://aims.fao.org/aos/agrovoc/c_2628 http://aims.fao.org/aos/agrovoc/c_10810 http://aims.fao.org/aos/agrovoc/c_2963 http://aims.fao.org/aos/agrovoc/c_16411 http://aims.fao.org/aos/agrovoc/c_4936 http://aims.fao.org/aos/agrovoc/c_37936 http://aims.fao.org/aos/agrovoc/c_37934 http://aims.fao.org/aos/agrovoc/c_32668 http://aims.fao.org/aos/agrovoc/c_2594 http://aims.fao.org/aos/agrovoc/c_28665 http://aims.fao.org/aos/agrovoc/c_5083 http://aims.fao.org/aos/agrovoc/c_1344 http://aims.fao.org/aos/agrovoc/c_27081 http://aims.fao.org/aos/agrovoc/c_3807 http://aims.fao.org/aos/agrovoc/c_15968 http://aims.fao.org/aos/agrovoc/c_24040 http://aims.fao.org/aos/agrovoc/c_935 http://aims.fao.org/aos/agrovoc/c_24103 Tunisie http://aims.fao.org/aos/agrovoc/c_8007 West Nile fever (WNF) is a viral disease of wild birds transmitted by mosquitoes. Humans and equids can also be affected and suffer from meningoencephalitis. In Tunisia, two outbreaks of WNF occurred in humans in 1997 and 2003; sporadic cases were reported on several other years. Small-scale serological surveys revealed the presence of antibodies against WN virus (WNV) in equid sera. However, clinical cases were never reported in equids, although their population is abundant in Tunisia. This study was achieved to characterize the nationwide serological status of WNV in Tunisian equids. In total, 1189 sera were collected in 2009 during a cross-sectional survey. Sera were tested for IgG antibodies, using ELISA and microneutralization tests. The estimated overall seroprevalence rate was 28%, 95% confidence interval [22; 34]. The highest rates were observed (i) in the north-eastern governorates (Jendouba, 74%), (ii) on the eastern coast (Monastir, 64%) and (iii) in the lowlands of Chott El Jerid and Chott el Gharsa (Kebili, 58%; Tozeur, 52%). Environmental risk factors were assessed, including various indicators of wetlands, wild avifauna, night temperature and chlorophyllous activity (normalized difference vegetation index: NDVI). Multimodel inference showed that lower distance to ornithological sites and wetlands, lower night-time temperature, and higher NDVI in late spring and late fall were associated with higher serological prevalence rate. The model-predicted nationwide map of WNF seroprevalence rate in Tunisian equids highlighted different areas with high seroprevalence probability. These findings are discussed in the perspective of implementing a better WNF surveillance system in Tunisia. This system might rely on (i) a longitudinal survey of sentinel birds in high-risk areas and time periods for WNV transmission, (ii) investigations of bird die-offs and (iii) syndromic surveillance of equine meningoencephalitis. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/575098/1/document_575098.pdf application/pdf Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1111/tbed.12077 10.1111/tbed.12077 info:eu-repo/semantics/altIdentifier/doi/10.1111/tbed.12077 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1111/tbed.12077 info:eu-repo/grantAgreement/EC/FP7/261504//(EU) Biology and control of vector-borne infections in Europe/EDENEXT |