Surveillance of Avian Influenza Viruses in Northern Pintails (Anas acuta) in Tohoku District, Japan

Jahangir, Alam; Watanabe, Yuko; Chinen, Omoto; Yamazaki, Shoki; Sakai, Kouji; Okamura, Masashi; Nakamura, Masayuki; Takehara, Kazuhiko

doi:10.1637/1933-5334(2008)3[e5:soaivi]2.0.co;2

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Influenza subtypes H3N8 and H4N6 were the most common among northern pintails sampled in Alaska (Fig. 1), similar to previous surveys of LPAI in Alaskan wild waterfowl (Ito et al 1995;Runstadler et al 2007), but different from subtype combinations found among northern pintails in Japan during winter (Jahangir et al 2008). Additional research is needed on whole LPAI genome surveys of wintering populations of northern pintails in both Asia and North America, but initial indications are that the number of Asian lineages per isolate is lower on wintering areas , likely a result of continuous reassortment and distance from the source of Asian lineages.…”

Section: Discussionsupporting

confidence: 86%

See 1 more Smart Citation

Genetic evidence of intercontinental movement of avian influenza in a migratory bird: the northern pintail (Anas acuta)

et al. 2008

View full text Add to dashboard Cite

The role of migratory birds in the movement of the highly pathogenic (HP) avian influenza H5N1 remains a subject of debate. Testing hypotheses regarding intercontinental movement of low pathogenic avian influenza (LPAI) viruses will help evaluate the potential that wild birds could carry Asian-origin strains of HP avian influenza to North America during migration. Previous North American assessments of LPAI genetic variation have found few Asian reassortment events. Here, we present results from whole-genome analyses of LPAI isolates collected in Alaska from the northern pintail (Anas acuta), a species that migrates between North America and Asia. Phylogenetic analyses confirmed the genetic divergence between Asian and North American strains of LPAI, but also suggested inter-continental virus exchange and at a higher frequency than previously documented. In 38 isolates from Alaska, nearly half (44.7%) had at least one gene segment more closely related to Asian than to North American strains of LPAI. Additionally, sequences of several Asian LPAI isolates from GenBank clustered more closely with North American northern pintail isolates than with other Asian origin viruses. Our data support the role of wild birds in the intercontinental transfer of influenza viruses, and reveal a higher degree of transfer in Alaska than elsewhere in North America.

show abstract

Section: Discussionsupporting

confidence: 86%

“…1995; Runstadler et al . 2007), but different from subtype combinations found among northern pintails in Japan during winter (Jahangir et al . 2008).…”

Section: Discussionmentioning

confidence: 84%

Genetic evidence of intercontinental movement of avian influenza in a migratory bird: the northern pintail (Anas acuta)

et al. 2008

View full text Add to dashboard Cite

show abstract

Section: Discussioncontrasting

confidence: 68%

“…In addition to sequence diversity, we also observed substantial variation in the subtype distribution of the transmembrane glycoproteins HA and NA between northern pintail isolates from Alaska and California. These frequency distributions also differ substantially from those observed among northern pintail LPAI viruses collected and isolated in Japan during the same time period as in our analysis (Jahangir et al 2008). Categorizing virus isolates by subtype is imperative for surveillance programs to identify possible pathogenic strains, such as H2, H5, and H7, but may be of limited use for assessments of reassortment and virus exchange among continents due to the lack of complete geographic separation of these lineages (e.g., Figs 3 and 4).…”

Section: Frequency Of Asian Lineages and Lpai Subtype Diversitycontrasting

confidence: 67%

Avian influenza at both ends of a migratory flyway: characterizing viral genomic diversity to optimize surveillance plans for North America

Pearce

Ramey

Flint

et al. 2009

Evolutionary Applications

View full text Add to dashboard Cite

Although continental populations of avian influenza viruses are genetically distinct, transcontinental reassortment in low pathogenic avian influenza (LPAI) viruses has been detected in migratory birds. Thus, genomic analyses of LPAI viruses could serve as an approach to prioritize species and regions targeted by North American surveillance activities for foreign origin highly pathogenic avian influenza (HPAI). To assess the applicability of this approach, we conducted a phylogenetic and population genetic analysis of 68 viral genomes isolated from the northern pintail (Anas acuta) at opposite ends of the Pacific migratory flyway in North America. We found limited evidence for Asian LPAI lineages on wintering areas used by northern pintails in California in contrast to a higher frequency on breeding locales of Alaska. Our results indicate that the number of Asian LPAI lineages observed in Alaskan northern pintails, and the nucleotide composition of LPAI lineages, is not maintained through fall migration. Accordingly, our data indicate that surveillance of Pacific Flyway northern pintails to detect foreign avian influenza viruses would be most effective in Alaska. North American surveillance plans could be optimized through an analysis of LPAI genomics from species that demonstrate evolutionary linkages with European or Asian lineages and in regions that have overlapping migratory flyways with areas of HPAI outbreaks.

show abstract

Trends in global warming and evolution of polymerase basic protein 2 family from influenza a virus

Yan¹,

Wu²

2009

JBiSE

View full text Add to dashboard Cite

Both global warming and influenza trouble humans in varying ways, therefore it is important to study the trends in both global warming and evolution of influenza A virus, in particular, proteins from influenza A virus. Recently, we have conducted two studies along this line to determine the trends between global warming and polymerase acidic protein as well as matrix protein 2. Although these two studies reveal some interesting findings, many studies are still in need because at least there are ten different proteins in influenza A virus. In this study, we analyze the trends in global warming and evolution of polymerase basic protein 2 (PB2) from influenza A virus. The PB2 evolution from 1956 to 2008 was defined using the unpredictable portion of amino-acid pair. Then the trend in this evolution was compared with the trend in the global temperature, the temperature in north and south hemispheres, and the temperature in influenza A virus sampling site and species carrying influenza A virus. The results show the similar trends in global warming and in PB2 evolution, which are in good agreement with our previous studies in polymerase acidic protein and matrix protein 2 from influenza A virus.

show abstract

Surveillance of Avian Influenza Viruses in Northern Pintails (Anas acuta) in Tohoku District, Japan

Cited by 3 publications

References 0 publications

Genetic evidence of intercontinental movement of avian influenza in a migratory bird: the northern pintail (Anas acuta)

Genetic evidence of intercontinental movement of avian influenza in a migratory bird: the northern pintail (Anas acuta)

Avian influenza at both ends of a migratory flyway: characterizing viral genomic diversity to optimize surveillance plans for North America

Trends in global warming and evolution of polymerase basic protein 2 family from influenza a virus

Contact Info

Product

Resources

About