Table 2. Virus detection by egg culture and titers (log₁₀EID₅₀/200 μl) of nasal swabs collected from each horse experimentally inoculated with equine influena virus (H3N8).

Horse #	Post-infection day
	0	1	2	3	4	5	6	7
1	-a)	-	2.3	NDb)	ND	ND	ND	ND
2	-	-	3.5	2.0	ND	ND	ND	ND
3	-	-	4.0	3.0	ND	ND	ND	ND
4	-	≤0.7	3.5	2.3	1.5	2.8	1.7	-

^a) <0.7 (no virus was isolated from four eggs inoculated with nasal swab specimens diluted 1:10).

^b) Not Done: Horses were already necropsied.