Circulation of avian influenza viruses in wild birds in Inner Niger Delta, Mali

Cappelle, Julien; Almeida, Renata Servan de; Fofana, Bouba; Dakouo, Martin; Balança, Gilles; Gil, Patricia; Albina, Emmanuel; Gaidet, Nicolas

doi:10.1111/j.1750-2659.2011.00314.x

Cited by 23 publications

(24 citation statements)

References 12 publications

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“…The seasonal pattern observed in Mali is in agreement with the lower circulation of AIV during the rainy season observed in wild birds in Mali [25]. This lower circulation of both AIV and NDV in Mali during the rainy season may be due to strong ecological constraints associated with seasonality.…”

Section: Maysupporting

confidence: 84%

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Empirical analysis suggests continuous and homogeneous circulation of Newcastle disease virus in a wide range of wild bird species in Africa

et al. 2014

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SUMMARYNewcastle disease (ND) is one of the most important poultry diseases worldwide and can lead to annual losses of up to 80% of backyard chickens in Africa. All bird species are considered susceptible to ND virus (NDV) infection but little is known about the role that wild birds play in the epidemiology of the virus. We present a long-term monitoring of 9000 wild birds in four African countries. Overall, 3·06% of the birds were PCR-positive for NDV infection, with prevalence ranging from 0% to 10% depending on the season, the site and the species considered. Our study shows that ND is circulating continuously and homogeneously in a large range of wild bird species. Several genotypes of NDV circulate concurrently in different species and are phylogenetically closely related to strains circulating in local domestic poultry, suggesting that wild birds may play several roles in the epidemiology of different NDV strains in Africa. We recommend that any strategic plan aiming at controlling ND in Africa should take into account the potential role of the local wild bird community in the transmission of the disease.

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Section: Maysupporting

confidence: 84%

“…This monitoring programme was designed to study both AIV and NDV in African wild birds [25][26][27]. Thus, the study did not focus on waterfowl only and studies on NDV epidemiology were concurrently implemented in poultry [28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Empirical analysis suggests continuous and homogeneous circulation of Newcastle disease virus in a wide range of wild bird species in Africa

et al. 2014

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“…When order names are underlined, it means that virus isolation has been used at least once in a study to detect this haemagglutinin or neuraminidase. Numbers refer to literature references H N species such as the red-billed quelea (Quelea quelea) that has been shown to be susceptible for IAV experimentally and in nature (Breithaupt et al 2010;Cappelle et al 2012;Caron et al 2015). Similarly, swallows (hirundidae family) are a group of species that commonly roost in very large and dense flocks of up to several million birds providing an ideal host system for IAV maintenance.…”

Section: Discussionmentioning

confidence: 99%

Challenging the conceptual framework of maintenance hosts for influenza A viruses in wild birds

Caron

Cappelle

Gaidet

2016

Journal of Applied Ecology

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The conceptual framework considering Anseriformes and Charadriiformes as the main maintenance hosts for influenza A viruses (IAV) in wild birds has shaped IAV research and surveillance over the last decades. We challenge this framework by reviewing the world-wide surveillance data on non-Anseriformes and non-Charadriiformes (NANC) species, generally considered as playing little role in IAV maintenance, available in literature and online data bases (close to 200 sources). Globally, we found an IAV infection rate of 1·51% (95% CI, 1·44–1·59%) for c. 101 000 birds tested from NANC species. If Anseriformes have, as expected, a higher infection rate than any other bird orders, eight bird orders have an infection rate higher or close to the Charadriiformes infection rate, challenging the status of Charadriiformes. We interpret the attention paid in favour of Charadriiformes by an extrapolation bias from data collected in hotspots of IAV infection in Charadriiformes (e.g. Delaware Bay, USA). The growing data on IAV in wild birds world-wide, summarised here, support two non-exclusive hypotheses: (i) the quality of the diagnostic tools and techniques used explain the patterns observed; (ii) IAV maintenance is determined by complex multi-host systems composed of multiple bird species, dependent on the ecosystem and its bird diversity and composition. Synthesis and applications. Our results have two main implications. First, new research and surveillance should be designed in order to understand influenza A viruses ecology in wild birds across the world, along with appropriate diagnostic tools and new hypotheses and dedicated protocols. This should be done in line with our new conceptual framework that conveys less a priori than its predecessor. Second, our results call for more bridging between biological and epidemiological sciences in order to tackle disease ecology in multi-host systems. (Résumé d'auteur

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“…A region in which the need for surveillance is particularly great is tropical Africa, where H5N1 has been confirmed in eleven countries [7, 8]. To date, surveillance in the region has focused on poultry, ducks, and shore birds [9–12]; however, the prevalence of AIV in other birds merits investigation in light of the discovery that songbirds in the order Passeriformes are also important hosts of H7N9 [5, 13, 14]. For example, sequence analysis of H7N9 viruses isolated from humans indicates that 75% of the genome is genetically similar to that of viruses isolated from songbirds [5].…”

Section: Introductionmentioning

confidence: 99%

Seasonality dynamics of avian influenza occurrences in Central and West Africa

Fuller

Ducatez

Njabo

et al. 2014

Preprint

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SUMMARY Understanding seasonal cycles of viruses originating in wildlife can provide insight into their likelihood of persistence in animal populations and inform policies to limit spillover to human populations. Avian influenza virus (AIV) is an important zoonotic agent causing seasonal occurrence of avian influenza (AI) in wild birds in temperate areas. Although the seasonality of AIV transmission in tropical birds is largely unknown, peaks of influenza activity in human populations in the tropics coincide with the rainy season. To assess the seasonality of AI in tropical birds, from 2010-14, we sampled 40,099 birds at 32 sites in Central Africa (Cameroon, Central African Republic, Congo-Brazzaville, and Gabon) and West Africa (Benin, Côte d’Ivoire, and Togo). Although AIV was not isolated by egg culture, in Central Africa, detection rates by real-time RT-PCR were 3.57% for passerine songbirds and 8.74% for Anatid ducks. RT-PCR positivity in resident birds increased when Palearctic migrants arrived in Central Africa. At sampling sites with two annual wet seasons, the positive rate in wild birds was greatest during the big rainy season in September – October. This study provides the first evidence that AI is present in Central African birds and identifies environmental factors associated with cases.

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Circulation of avian influenza viruses in wild birds in Inner Niger Delta, Mali

Cited by 23 publications

References 12 publications

Empirical analysis suggests continuous and homogeneous circulation of Newcastle disease virus in a wide range of wild bird species in Africa

Empirical analysis suggests continuous and homogeneous circulation of Newcastle disease virus in a wide range of wild bird species in Africa

Challenging the conceptual framework of maintenance hosts for influenza A viruses in wild birds

Seasonality dynamics of avian influenza occurrences in Central and West Africa

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