CLEC4D and susceptibility to pneumonia measurement: The majority of C-type lectin receptors remain uncharacterized in their roles against respiratory pathogens, however, C-type lectin domain family 4 member D (CLEC4D), is protective against K. pneumoniae-induced pneumonia, whereby Clec4d knockout mice exhibit increased mortality, lung damage and bacterial CFU, which may be attributed to a defect in neutrophil clearance [73].