Table 1.

TCID₅₀ per ml values obtained at 56 and 65°C

	56°C					65°C
Time (minute)	0·5	15	30	60	120	0·5	15	30	60	120
Sample 1	105·5	100·67	ND	ND	ND	104·67	ND	ND	ND	ND
Sample 2	106·17	101·0	100·67	ND	ND	102·00	ND	ND	ND	ND
Sample 3	104·67	ND	101·33	ND	100·67	103·67	ND	ND	ND	ND

Time zero values were 10^5·59 TCID₅₀ per ml for each sample. ND: not detected (below the limit of virus detection which corresponded to 10^0·67 TCID₅₀ per ml). The whole experiment was performed twice with similar results (data not shown).