CD40LG and Kallmann syndrome: In addition, we assessed the distribution of circulating immune cells in patients subgrouped according to persistent dyspnoea at the post-COVID-19 check-up (Figure 1c), anosmia/ageusia (Figure 1d), serum IgG levels at post-COVID sampling (Figure 1e), serum IgM levels at post-COVID sampling (Figure 1e), DLCO (%predicted) at post-COVID sampling (Figure 1g), and gender (Figure 1h).