CD8A and susceptibility to pneumonia measurement: There are 4 associations included: family Oxalobacteraceae impacting CD16+ monocyte % monocyte, genus Oscillospira impacting Basophil %CD33dim HLA DR− CD66b−, class Mollicutes impacting CD8 on Natural Killer T and phylum Tenericutes impacting CD8 on Natural Killer T. While current literature has not yet established an association between Basophil %CD33dim HLA DR− CD66b− cells/CD8 on Natural Killer T cells and pneumonia, extensive studies have conclusively demonstrated the critical role of CD16+ monocytes in the pathogenesis and progression of pneumonia [18, 19, 20, 21, 22].