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Open Access Short report

Isolation of a reassortant H13N2 virus from a mallard fecal sample in South Korea

Hyun-Mi Kang1, Jun-Gu Choi1, Min-Chul Kim1, Hye-Ryoung Kim2, Jae-Ku Oem2, You-Chan Bae2, Mi-Ra Paek1, Jun-Hun Kwon1 and Youn-Jeong Lee1*

Author Affiliations

1 Avian Disease Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, 175 Anyangro, Anyangsi, Gyeonggido, 430-757, Republic of Korea

2 Animal Disease Diagnostic Division, Animal, Plant and Fisheries Quarantine and Inspection Agency, 175 Anyangro, Anyangsi, Gyeonggido, 430-757, Republic of Korea

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Virology Journal 2012, 9:133  doi:10.1186/1743-422X-9-133

Published: 23 July 2012

Abstract

Background

Virus subtype H13N2, A/mallard/Kr/SH38-45/2010 (H13N2), was first isolated from a mallard fecal sample in South Korea.

Results

Phylogenetic analysis of all eight viral genes revealed that this virus emerged by genetic mixing between Eurasian and North American gene pools, and possibly between wild ducks and gulls. The H13 and N2 surface genes clustered together in a group with Eurasian isolates from gulls and wild birds, respectively. The PB2, PA, NP, M and NS segments belonged to the Eurasian lineage, whereas the PB1 gene clustered in the North American lineage. Furthermore, they showed a bird-dependent pattern in phylogenetic analysis: the M gene was similar to subtype H13 viruses within gulls, whereas other segments were similar to avian influenza viruses of other subtypes from wild ducks.

Conclusions

The data suggests that the novel reassortant H13N2 virus isolated in South Korea might have emerged by genetic reassortment between intercontinental and interspecies transmission in wild birds.

Keywords:
Avian influenza virus; H13N2; Mallard; Phylogenetic analysis; South Korea