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. 2021 Sep 21;77(1):258–270. doi: 10.1111/all.15091

Kärber Calculation: Virus Titer = L + d(S − 0.5)

L = 1st dilution on the plate

D = difference between log dilution steps (0.6)

S = sum of wells showing CPE/total no. of wells per dilution

0.5 = constant

Serum Titer = L + d(S − 0.5)

L = 1st dilution on the plate

D = difference between log dilution steps (0.3)

S = sum of wells showing no CPE/total no. of wells per dilution

0.5 = constant