The Relative Expression (RE) of the abaR and aidA genes of the Quorum network (QS/QQ) was quantified by RT-qPCR analysis of the 17 isolates of A. baumannii from colonized patients and of the 13 isolates of A. baumannii from patients with pneumonia (Figure 1A). This evidence concerns the gene AIDA and susceptibility to pneumonia measurement.