Influence of Seasonality and Circulating Cytokines on Serial QuantiFERON Discordances

Figure 1

The results of the QFT of 9 out of the 28 individuals with serially discordant results are graphed here. A positive result is defined as an antigen response of 0.35 IU of IFN-γ or greater (after subtracting the IFN-γ measured in the nil QFT tube). The spring time points for each individual are identified with a star on the graph.