Identification of swine H1N2/pandemic H1N1 reassortant influenza virus in pigs, United States
Ahmed Ali,
Mahesh Khatri,
Leyi Wang1,
Yehia M. Saif,
Chang-Won Lee,
The Ohio State University, Food Animal Health Research Program, Ohio Agricultural Research and Development Center, 1680 Madison Avenue, Wooster, OH 44691, USA
Received 14 September 2011. Revised 2 February 2012. Accepted 9 February 2012. Available online 17 February 2012.
http://dx.doi.org/10.1016/j.vetmic.2012.02.014, How to Cite or Link Using DOI
Abstract
In October and November 2010, novel H1N2 reassortant influenza viruses were identified from pigs showing mild respiratory signs that included cough and depression. Sequence and phylogenetic analysis showed that the novel H1N2 reassortants possesses HA and NA genes derived from recent H1N2 swine isolates similar to those isolated from Midwest. Compared to the majority of reported reassortants, both viruses preserved human-like host restrictive and putative antigenic sites in their HA and NA genes. The four internal genes, PB2, PB1, PA, and NS were similar to the contemporary swine triple reassortant viruses’ internal genes (TRIG). Interestingly, NP and M genes of the novel reassortants were derived from the 2009 pandemic H1N1. The NP and M proteins of the two isolates demonstrated one (E16G) and four (G34A, D53E, I109T, and V313I) amino acid changes in the M2 and NP proteins, respectively. Similar amino acid changes were also noticed upon incorporation of the 2009 pandemic H1N1 NP in other reassortant viruses reported in the U.S. Thus the role of those amino acids in relation to host adaptation need to be further investigated. The reassortments of pandemic H1N1 with swine influenza viruses and the potential of interspecies transmission of these reassortants from swine to other species including human indicate the importance of systematic surveillance of swine population to determine the origin, the prevalence of similar reassortants in the U.S. and their impact on both swine production and public health.
Keywords
Influenza;
Swine;
Pandemic H1N1;
Reassortant;
H1N2
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Figures and tables from this article:
Fig. 1. Phylogenetic analyses of each of the 8 gene segments based on nucleotide sequences from new reassortant H1N2 viruses and other sequences available from GenBank. Abbreviations: SW, swine; DK, duck; TK, turkey. Standard two-letter abbreviations are used for states in the United States. Reassortants identified in Ohio (Bold and ▶), swine/pandemic H1N1 reassortants from other States (■) and other countries (▴) are indicated.
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Table 1. Genetic characterization of the A/swine/Ohio/FAH10-1/2010 and A/swine/Ohio/FAH11-1/2010 reassortant viruses.
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Table 2. Comparison of amino acid residues in the HA, NA, NP and M2 proteins of A/Swine/Ohio/FAH10-1/10 and other reported reassortants.
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Table 3. Cross-HI results expressed as percentage of antigenic relatedness.
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Corresponding author. Tel.: +1 330 263 3750; fax: +1 330 263 3677.1
Present address: Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, USA.
http://www.sciencedirect.com/science/ar ... 3512001241
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