PTH and pneumocystosis: After a successful treatment of the PJP episode, we noted a drop in 1,25-dihydroxyvitamin D serum levels (from 124 ± 61.7 to 28 ± 23.2 pg/mL, p = 0.006), and a return of PTH serum levels to their previous values (from 35 ± 34 to 137 ± 99 pg/mL, p = 0.009), as depicted in Fig. 2.