Table 3. Growth efficiency of Vero-adapted influenza H5N1 virus (Vero-15) in microcarrier-based Vero cell cultures in 100-ml spinner flasks.

	Virus titers
Days post infection	HA units/50 µL	TCID50/ml (log10)
2	<4	3.83±0.19
3	128	7.71±0.10
4	1024	8.58±0.07
5	1024	8.78±0.10
6	2048	8.60±0.00

HA: hemagglutination.

TCID₅₀ (50% tissue culture infectious dose) was measured in triplicate and shown as geometric mean ± standard error of mean.