IFNG and asthma: The analysis of the correlation between the changes in serum IFN-γ concentrations and the changes in the clinical course of asthma revealed that at week 6 post-vaccination the most significant increase in the serum IFN-γ concentrations was observed in the patients with mild asthma (p < 0.05) and those with fewer asthma exacerbations (p < 0.01) compared to the pre-vaccination period (Table 5).