Table 2. Antigenic analysis of H3N2 subtype canine influenza viruses, China, 2009–2017*.

Antigenic group and virus	HI titer, by antigenic group and antiserum
	A, 814/2009	A, 362/2009	B, 0110-2/2014	B, 0118-256/2015	B, 0120-265/2015	C, 1228-9/2016	C, 0512-13720/17	C, 0527-147/2017
A
814/2009	1,280†	1,280	1,280	160	320	320	320	160
1527/2009	640	1,280	2,560	320	160	320	320	320
1579/2009	640	2,560	1,280	160	160	320	320	320
362/2009	640	1,280†	1,280	320	160	320	160	160
B
1215-34/2012	160	640	1,280	160	640	1,280	640	1,280
0203-342/2013	320	640	640	640	640	640	1,280	320
1207-365/2013	320	640	1,280	640	1,280	640	1,280	640
0110-2/2014	640	2,560	1,280†	640	320	1,280	640	640
0118-256/2015	320	640	1,280	1,280†	640	640	320	320
0120-265/2015	640	640	1,280	640	1,280†	640	320	640
0124-300/2015	320	1280	1280	640	640	160	640	640
C
1228-9/2016	80	80	80	160	1,280	1,280†	640	640
0424-102/2017	80	80	320	80	160	640	640	1,280
0512-120/2017	80	80	320	160	320	640	1,280	1,280
0512-133/2017	80	40	320	40	160	640	640	1,280
0512-137/2017	160	80	320	160	320	1,280	1,280†	640
0527-148/2017	80	80	320	80	320	640	2,560	1,280
0527-146/2017	80	40	320	80	320	640	640	640
0527-147/2017	80	320	320	160	160	2,560	1,280	1,280†
0601-159/2017	80	40	320	80	160	640	640	640
0610-173/2017	40	40	320	80	160	640	640	640
0721-36/2017	80	40	320	80	160	640	640	640

*Virus names are abbreviated as serial number and year. HI titers are the inverse of the highest dilution that inhibited hemagglutination. Cells containing moderate HI titers (160, 320) are shaded gray and high titers (>640) black. Low HI titers (40, 80) were not shaded. HI, hemagglutinin inhibition.
†Homologous titers.