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Volume 23, Number 4—April 2017
Dispatch

Antiviral Drug–Resistant Influenza B Viruses Carrying H134N Substitution in Neuraminidase, Laos, February 2016

Tatiana Baranovich, Phengta Vongphrachanh, Pakapak Ketmayoon, Thongchanh Sisouk, Khampheng Chomlasack, Viengphone Khanthamaly, Ha Thuy Nguyen, Vasiliy P. Mishin, Henju Marjuki, John Barnes, Rebecca J. Garten, James Stevens, David Wentworth, and Larisa GubarevaComments to Author 
Author affiliations: Carter Consulting, Inc., Atlanta, Georgia, USA (T. Baranovich); World Health Organization Collaborating Center for Surveillance, Epidemiology and Control of Influenza, Atlanta (T. Baranovich, V. Khanthamaly, H.T. Nguyen, V.P. Mishin, H. Marjuki, J.R. Barnes, R.J. Garten, J. Stevens, D.E. Wentworth, L.V. Gubareva); Centers for Disease Control and Prevention, Atlanta (T. Baranovich, V. Khanthamaly, H.T. Nguyen, V.P. Mishin, H. Marjuki, J.R. Barnes, R.J. Garten, J. Stevens, D.E. Wentworth, L.V. Gubareva); National Center for Laboratory and Epidemiology, Vientiane, Laos (P. Vongphrachanh, P. Ketmayoon, T. Sisouk, K. Chomlasack); World Health Organization Emerging Disease Surveillance and Response Unit, Vientiane, Laos (P. Ketmayoon); Battelle Memorial Institute, Atlanta (H.T. Nguyen)

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Figure 1

Neuraminidase gene segment (nts 399–497) of influenza B/Laos/0080/2016 virus carrying NA-H134 (A) and B/Laos/0654/2016, NA-N134 (B). RNA extracted from respiratory specimens was used for reverse transcription PCR (RT-PCR) amplification. Two primers, NA-B-242F (5′-CATACCCGCGTTTATCTTGC-3′, forward primer) and NA-B-426Rb (biotin-5′-CTGTCTCCTCTTGTTCCATTGTAG-3′, reverse biotinylated primer) were used in RT-PCR, essentially as described previously (10); primer NA-B-378Fs (5′-TGCAAACACTTTGCTTTAAC-3′) w

Figure 1. Neuraminidase gene segment (nts 399–497) of influenza B/Laos/0080/2016 virus carrying NA-H134 (A) and B/Laos/0654/2016, NA-N134 (B). RNA extracted from respiratory specimens was used for reverse transcription PCR (RT-PCR) amplification. Two primers, NA-B-242F (5′-CATACCCGCGTTTATCTTGC-3′, forward primer) and NA-B-426Rb (biotin-5′-CTGTCTCCTCTTGTTCCATTGTAG-3′, reverse biotinylated primer) were used in RT-PCR, essentially as described previously (10); primer NA-B-378Fs (5′-TGCAAACACTTTGCTTTAAC-3′) was used for pyrosequencing. Underlining indicates nucleotide triplet encoding amino acid residue 134.Shading indicates the nucleotides used to determine the proportion of H134 and N134 neuraminidase variants. Pyrosequencing dispensation order: E-Enzyme mixture; S-substrate mixture; G, C, A and T – nucleotides dGTP, dCTP; dATPαS and dTTP, correspondingly.

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