註:+號表有觀察到CPE,-號表無
資料整理如下:
Dilution No.of cultures Cumulative Cumulative no. Calculated
of virus showing CPE/no. no. infected not infected infectivity
inoculated Ratio Percent
10 8/8 44 0 44/44 100
10 8/8 36 0 36/36 100
10 7/8 28 1 28/29 96
10 8/8 21 1 21/22 95
10 6/8 13 3 13/16 81
10 3/8 7 8 7/15 46
10 1/8 4 15 4/19 21
10 1/8 3 22 3/25 12
10 1/8 2 29 2/31 6
10 1/8 1 36 1/37 2
取10 ,10 之資料代入式子:
infectivity above 50% - 50% 81-50
--------------------------------------------- = -------- = 0.885
infectivity above 50% - infectivity below 50% 81-46
故其TCID 為 10 /0.1ml
而其力價(Virus Titer)等於 10 TCID
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