STK11 and susceptibility to pneumonia measurement: Two recent studies, including one from our group, reported that lack of Lkb1 in the myeloid lineage of mice is associated with reduced numbers of AMs [6, 7], which was accompanied by an impaired antibacterial defense during pneumonia caused by Klebsiella (K.)pneumoniae [6] or Staphylococcus (S.)aureus [7].