Summary
The time of appearance of cytopathic changes was studied in vaccinia virus infected tissue culture tubes. From proportions of consecutively recorded positive tubes it was inferred that the cumulative percentages of newly formed plaques plotted on a probit scale formed a straight line against time. In a given experiment this distribution was of the same type irrespective of the virus dose.
In repeatedly read virus titrations an approximately linear relationship was found to exist between the logarithm of virus dilution and the reciprocal of incubation time (= the period from the moment of inoculation until the first positive reading). The relation was rectilinear within a dose interval of 4–5 log units but outside this range departure from linearity was found.
For practical reasons the incubation time method was less useful as a routine procedure for virus assay.
End-point titers in monkey kidney tubes increased by 0.15–0.20 log from day 6 to day 12.
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Espmark, J.Å. Time relationships in the development of cytopathic response to vaccinia virus in tissue culture tubes. Archiv f Virusforschung 15, 123–136 (1965). https://doi.org/10.1007/BF01257724
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DOI: https://doi.org/10.1007/BF01257724