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. 2022 Aug 25;43(1):31–45. doi: 10.1007/s10875-022-01354-x

Fig. 7.

Fig. 7

Adaptation of the vaccine strategy according to the age and the results of QFN and serology. This decision tree shows a possible interpretation of the results of QFN (IFNγ Ag1 + 2) and serology (S (RBD)-specific IgG) according to the proposed thresholds. After the third dose, threshold of QFN for omicron could not be calculated due to its poor predictive ability in the population tested (tbd = to be determined)