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Volume 19, Number 3—March 2013

Dispatch

Swine Influenza in Sri Lanka

Harsha K. K. Perera, Geethani Wickramasinghe, Chung L. Cheung, Hiroshi Nishiura, David K. Smith, Leo L. M. Poon, Aluthgama K. C. Perera, Siu K. Ma, Narapiti P. Sunil-Chandra, Yi Guan, and Joseph S. M. PeirisComments to Author 
Author affiliations: Author affiliations: University of Hong Kong, Hong Kong Special Administrative Region, People’s Republic of China (H.K.K. Perera, C.L. Cheung, H. Nishiura, D.K. Smith, L.L.M. Poon, S.K. Ma, Y. Guan, J.S.M. Peiris); University of Kelaniya, Kelaniya, Sri Lanka (H.K.K. Perera, N.P. Sunil-Chandra); Medical Research Institute, Colombo, Sri Lanka (G. Wickramasinghe); Japan Science and Technology Agency, Kawaguchi, Japan (H. Nishiura); Colombo Municipal Council, Colombo (A.K.C. Perera)

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Table 2

Homologous serological reaction profile to subtypes of influenza viruses among pigs, Sri Lanka, 2004–2005 and 2010–2012*

Virus antigen (lineage) Seroprevalence, no. (%)
Jan 2004–Mar 2005, n = 300 Feb–Aug 2010,
n = 149 Sep 2010–Mar 2011, n = 284 Apr–Oct 2011,
n = 577 Nov 2011–May 2012, n = 763
A/swine/Colombo/48/2004 (H3N2) (human-like) 185 (61.6%) 06 (4.0%) 0 0 0
A/swine/HK/2422/98 (H3N2) (swine) (human) 0 0 0 0 0
A/Sydney/5/97 (H3N2) (human) 0 0 0 0 0
A/swine/HK/1774/99 (H3N2) (European swinelike) 0 0 0 0 0
A/HK/44062/2011 (H3N2) (human) Not tested Not tested 0 0 0
A/swine/Colombo/330/2009 (H1N1) (H1N1pdm09) 0 16 (10.7) 95 (33.5) 14 (25.1) 77 (10.1)
A/swine/HK/29/2009 (H1N1) (Eurasian avian) 0 01 (0.6) 0 0 0
A/swine/HK/1110/2006 (H1N1) (North American–triple reassortant) 0 01 (0.6) 0 0 0
A/swine/HK/915/2004 (H1N2) (North American–TR) 0 0 0 0 0
A/swine/HK/4167/99 (H1N1) (classical swine) 0 0 0 0 0
A/swine/Ghent/G112/2007 (Eurasian avian) 0 0 0 0 0

*Hemagglutination inhibition reciprocal antibody titers ≥40 were considered positive. The range of the antibody titers was 40 to ≥1,280. If serum reacted to multiple antigenically related influenza H3 or H1 subtype viruses, we categorized the serum as having a homologous reaction profile to the virus to which titer was ≥4-fold higher than that for other viruses of the same subtype. For example, during 2004–2005, some serum samples were seropositive for influenza A/swine/HK/2422/98 (H3N2) virus; however, because in the same sample, titer to influenza A/swine/Colombo/48/2004 (H3N2) virus was >4-fold higher, reactivity was attributed to the latter.

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