Volume 12, Number 7—July 2006
Dispatch
Detection of Infectious Poxvirus Particles
Figure 2

Figure 2. Comparison of probit (predicted proportion of replicates positive) regression curves for rpo18 (circles) and F1L (squares) genes calculated with SPSS software (SPSS Inc., Chicago, IL, USA). Probit versus vaccinia virus concentration was obtained from 12 replicates of 7 dilutions from 1,500 PFU to 0.1 PFU.