Table 2.

HI titers of mouse sera after infection with 2009 pH1N1 HA single and double glycosylation mutant viruses.

Virusb,c	Seraa
	142	172	177	71-142
rWT	80	80	80	80
144	<10	<10	<10	<10
144-172	<10	10	<10	<10
71-142-177	160	40	80	320
71-142-172-177	80	160	40	80
142	160	160	160	160
172	160	320	320	160
177	80	80	80	80
71-142	80	40	80	320

^aMice were infected with the recombinant Neth/09 virus containing HA glycosylations at the indicated residues.

^bHI titers represent the reciprocal of the highest dilution that displayed hemagglutination inhibitory activity.

^cHomologous titers are in bold.