BDNF and asthma: While the serum BDNF levels reported in the current investigation exceed that of Virchow's group investigating asthma patients (Lommatzsch et al., 2005a,b), they are within the range measured in other studies involving healthy individuals and other patient populations, with reported serum BDNF levels spanning over four orders of magnitude (!), ranging from 0.005 to 280 ng/ml using different ELISA kits (Failla et al., 2016; Ihara et al., 2016; Jacoby et al., 2016; Kheirouri et al., 2016).