TABLE 4.

The P194Q ca virus is antigenically similar to the Egy/09 ca parent virus^a

Expt	Method	Virus	Antibody titer in postinfection antiserum raised against:
			Egy/09 ca parent			Egy/09 ca P194Q
			Ferret 1	Ferret 2	Ferret 3	Ferret 1	Ferret 2	Ferret 3
1	HAI	Egy/09 ca parent	8	16	32	32	32	16
		Egy/09 ca P194Q	32	32	64	128	256	128
2	MN	Egy/09 ca parent	Not done	Not done	Not done	320	640	1,280
		Egy/09 ca P194Q	Not done	Not done	Not done	320	640	1,280

^aSera from ferrets vaccinated with two doses of the indicated viruses at day 42 or day 56 postinfection were tested in separate experiments by HAI or microneutralization, respectively. Homologous titers are indicated in boldface type. The starting dilution for both assays was 1:10.