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Volume 16, Number 1—January 2010

Letter

Oseltamivir- and Amantadine-Resistant Influenza Virus A (H1N1)

Peter K.C. Cheng, Amanda P.C. To, Tommy W.C. Leung, Peter C.K. Leung, Connie W.C. Lee, and Wilina W.L. LimComments to Author 
Author affiliations: Department of Health, Hong Kong, People’s Republic of China

Main Article

Table

Prevalence of oseltamivir-resistant and amantadine- and oseltamivir-resistant influenza A virus (H1N1) detected in Hong Kong, with clade designations, July 2008–June 2009

Date detected No. isolates tested No. (%) isolates oseltamivir resistant No. (%) isolates oseltamivir and amantadine resistant Predominating influenza A virus (H1N1) clade, no. identified/total no. sequenced (%)
2008 Jul 462 78 (16.9) 4 (5.1) Clade 2C, 104/182 (57.1)
2008 Aug 313 45 (14.4) 1 (2.2) Clade 2C, 51/95 (53.7)
2008 Sep 61 21 (34.4) 1 (4.8) Clade 2B, 20/39 (51.3)
2008 Oct 19 13 (68.4) 0 Clade 2B, 13/16 (81.3)
2008 Nov 16 15 (93.8) 0 Clade 2B, 16/16 (100)
2008 Dec 45 44 (97.8) 0 Clade 2B, 41/41 (100)
2009 Jan 327 313 (95.7) 0 Clade 2B, 90/104 (86.5)
2009 Feb 769 755 (98.2) 0 Clade 2B, 138/153 (90.2)
2009 Mar 279 279 (100) 0 Clade 2B, 61/61 (100)
2009 Apr 63 63 (100) 2 (3.2) Clade 2B, 18/18 (100)
2009 May 22 22 (100) 2 (9.1) Clade 2B, 7/7 (100)
2009 Jun 77 77 (100) 46 (59.7) Clade 2B, 55/55 (100)

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