Table 2.

Swine 1A test antigens in hemagglutination inhibition assays with monovalent ferret antisera

			Serastrain	A/Ohio/9/2015a	A/Michigan/45/2015 H1N1	A/Michigan/45/2015 H1N1	A/Michigan/45/2015 H1N1
Clade	Global	Antigen	Clade	1A.3.3.3	Hu-Vac	Hu-Vac	Hu-Vac
gamma.1b	1A.3.3.3	A/Ohio/9/2015 H1N1va		2560		20	20
gamma.3b	1A.3.3.3	A/swine/Iowa/A01731653/2016 H1N2				40	40
pdmb	1A.3.3.2	A/swine/Spain/45690-9/2018 H1N1		80	1280
Hu-Vac	1A.3.3.2	A/Michigan/45/2015 H1N1			2560	320	640

Blank cells are untested antigens and repeated sera reflect different antisera or testing that occurred at different laboratories.

^aCVV or equivalent.

^bRepresents current swine strains.