Avian Influenza Viruses and Paramyxoviruses in Wintering and Resident Ducks in Texas

Hanson, Britta A.; Swayne, David E.; Senne, Dennis A.; Lobpries, David S.; Hurst, Justin; Stallknecht, David E.

doi:10.7589/0090-3558-41.3.624

Cited by 73 publications

(58 citation statements)

References 19 publications

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“…No evidence of exposure to avian influenza was uncovered even though many of the areas where feral swine were sampled have large seasonal concentrations of waterfowl. For example, the Gulf Coast of Texas and the central valley of California are major wintering grounds for waterfowl and other migratory birds, and AI is fairly prevalent in these areas (Hanson et al, 2005). Thus, based on these data, the potential for coinfection in feral swine with avian, human, and/or swine influenza appears to be low.…”

Section: Discussionmentioning

confidence: 98%

Influenza Exposure in United States Feral Swine Populations

Hall

Minnis

Campbell

et al. 2008

Journal of Wildlife Diseases

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ABSTRACT:Swine play an important role in the disease ecology of influenza. Having cellular receptors in common with birds and humans, swine provide opportunities for mixed infections and potential for genetic reassortment between avian, human, and porcine influenza. Feral swine populations are rapidly expanding in both numbers and range and are increasingly coming into contact with waterfowl, humans, and agricultural operations. In this study, over 875 feral swine were sampled from six states across the United States for serologic evidence of exposure to influenza. In Oklahoma, Florida, and Missouri, USA, no seropositive feral swine were detected. Seropositive swine were detected in California, Mississippi, and Texas, USA. Antibody prevalences in these states were 1% in Mississippi, 5% in California, and 14.4% in Texas. All seropositive swine were exposed to H3N2 subtype, the predominant subtype currently circulating in domestic swine. The only exceptions were in San Saba County, Texas, where of the 15 seropositive samples, four were positive for H1N1 and seven for both H1N1 and H3N2. In Texas, there was large geographical and temporal variation in antibody prevalence and no obvious connection to domestic swine operations. No evidence of exposure to avian influenza in feral swine was uncovered. From these results it is apparent that influenza in feral swine poses a risk primarily to swine production operations. However, because feral swine share habitat with waterfowl, prey on and scavenge dead and dying birds, are highly mobile, and are increasingly coming into contact with humans, the potential for these animals to become infected with avian or human influenza in addition to swine influenza is a distinct possibility.

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Section: Discussionmentioning

confidence: 98%

Influenza Exposure in United States Feral Swine Populations

Hall

Minnis

Campbell

et al. 2008

Journal of Wildlife Diseases

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“…It is evident that our understanding of AIV within wild bird populations is far from complete (Hanson et al, 2005;Spackman et al, 2005). Although results from this and other studies to date support the idea that AIV infection in shorebirds outside of Delaware Bay is very low, it is important to note that the localized, short-term, and species-specific relationship that have been observed with AIV and Ruddy Turnstones at Delaware Bay may occur at other localized sites worldwide.…”

Section: Discussionmentioning

confidence: 99%

Is the Occurrence of Avian Influenza Virus in Charadriiformes Species and Location Dependent?

Hanson

Luttrell

Goekjian

et al. 2008

Journal of Wildlife Diseases

104

101

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ABSTRACT:Birds in the order Charadriiformes were sampled at multiple sites in the eastern half of the continental USA, as well as at Argentina, Chile, and Bermuda, during 1999-2005, and tested for avian influenza virus (AIV). Of more than 9,400 birds sampled, AIV virus was isolated from 290 birds. Although Ruddy Turnstones (Arenaria interpres) comprised just 25% of birds sampled, they accounted for 87% of isolates. Only eight AIV isolations were made from birds at four locations outside of the Delaware Bay, USA, region; six of these were from gulls (Laridae). At Delaware Bay, AIV isolations were predominated by hemagglutinin (HA) subtype H10, but subtype diversity varied each year. These results suggest that AIV infection among shorebirds (Scolopacidae) may be localized, species specific, and highly variable in relation to AIV subtype diversity.

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“…This proposed AIV cycle, where birds act as agents for the spread of the virus along a migratory flyway has become widely accepted (Stallknecht and Brown 2008). However, evidence for this cycle of dispersal is fragmented because surveillance studies of waterfowl have been conducted independently at either wintering (Stallknecht et al 1990c, Sharp et al 1993, Hanson et al 2005, Ferro et al 2008 or breeding grounds , Ito et al 1995, Runstadler et al 2007, Ip et al 2008) but never at both. Studies of geese (genus: Anser) conducted throughout the annual cycle have provided insights into the antibody dynamics of AIV (Hoye et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…Other aspects of the AIV infection cycle remain less clear, such as which waterfowl species influence the seasonal epizootiology of viral strains. The mallard (Anas platyrhynchos) is typically reported as having high prevalence in North America , Alfonso et al 1995 and to a lesser degree the bluewinged teal (Anas discors) (Stallknecht et al 1990c, Hanson et al 2005, Ferro et al 2010a) and the northern shoveler (Anas clypeata) (Hill et al 2010, Goekjian et al 2011). However, infection patterns associated with age and species have not been verified through cross-seasonal studies within a migratory flyway.…”

Section: Introductionmentioning

confidence: 99%

Cross-Seasonal Patterns of Avian Influenza Virus in Breeding and Wintering Migratory Birds: A Flyway Perspective

Hill

Takekawa

Cardona

et al. 2012

Vector-Borne and Zoonotic Diseases

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The spread of avian influenza viruses (AIV) in nature is intrinsically linked with the movements of wild birds. Wild birds are the reservoirs for the virus and their migration may facilitate the circulation of AIV between breeding and wintering areas. This cycle of dispersal has become widely accepted; however, there are few AIV studies that present cross-seasonal information. A flyway perspective is critical for understanding how wild birds contribute to the persistence of AIV over large spatial and temporal scales, with implications for how to focus surveillance efforts and identify risks to public health. This study characterized spatio-temporal infection patterns in 10,389 waterfowl at two important locations within the Pacific Flyway-breeding sites in Interior Alaska and wintering sites in California's Central Valley during 2007-2009. Among the dabbling ducks sampled, the northern shoveler (Anas clypeata) had the highest prevalence of AIV at both breeding (32.2%) and wintering (5.2%) locations. This is in contrast to surveillance studies conducted in other flyways that have identified the mallard (Anas platyrhynchos) and northern pintail (Anas acuta) as hosts with the highest prevalence. A higher diversity of AIV subtypes was apparent at wintering (n = 42) compared with breeding sites (n = 17), with evidence of mixed infections at both locations. Our study suggests that wintering sites may act as an important mixing bowl for transmission among waterfowl in a flyway, creating opportunities for the reassortment of the virus. Our findings shed light on how the dynamics of AIV infection of wild bird populations can vary between the two ends of a migratory flyway.

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Avian Influenza Viruses and Paramyxoviruses in Wintering and Resident Ducks in Texas

Abstract: Cloacal swabs were collected from teal

Cited by 73 publications

References 19 publications

Influenza Exposure in United States Feral Swine Populations

Influenza Exposure in United States Feral Swine Populations

Is the Occurrence of Avian Influenza Virus in Charadriiformes Species and Location Dependent?

Cross-Seasonal Patterns of Avian Influenza Virus in Breeding and Wintering Migratory Birds: A Flyway Perspective

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