IL1B and susceptibility to pneumonia measurement: Although 9 of the 40 pneumonia suspects had detectable BALF IL-1β by ELISA, there was no correlation between ASC and the levels of IL-1β in BALF (p = 0.42) and we found no oligomers after crosslinking and immunoblots in 3 samples selected for having the highest ELISA detectable IL-β (data not shown).