Table 4.

Cumulative results of Russian influenza A viruses testing for susceptibility to antivirals in two WHO NICs during the period 2005–2012

Virus subtype	Antiviral drugs	Number and percent of influenza A viruses resistant to antiviral drugs
		2005/06	2006/07	2007/08	2008/09	2009/10	2010/11	2011/12
A(H3N2)	Rimantadine	51/98 (52.0)	74/132 (56.1)	38/60 (63.3)	128/142 (90.1)	0	3/3 (100)	114/114 (100)
	Oseltamivir	0/7 (0.0)	3/96 (3.1)	0/50 (0.0)	1/22 (4.5)	0	0/11 (0.0)	0/119 (0.0)
	Zanamivir	nt	nt	0/31 (0.0)	nt	0	0/3 (0.0)	0/106 (0.0)
A(H1N1)	Rimantadine	21/82 (25.6)	45/86 (52.3)	39/169 (23.1)	46/173 (26.5)	0	0	0
	Oseltamivir	0/25 (0.0)	8/30 (26.7)	100/127 (78.8)	243/275 (88.4)	0	0	0
	Zanamivir	nt	nt	0/21 (0.0)	0/7 (0.0)	0	0	0
A(H1N1)pdm09	Rimantadine	0	0	0	nt	52/52 (100)	58/58 (100)	nt
	Oseltamivir	0	0	0	0/2 (0.0)	1/95 (1.0)	0/160 (0.0)	0/3 (0.0)
	Zanamivir	0	0	0	nt	0/48 (0.0)	0/58 (0.0)	nt

Note: Percent of viruses resistant to antiviral drug is indicated in brackets; nt-no tested viruses; 0-no viruses of subtype indicated were isolated during the reported season