C3 and infectious posterior uveitis: Quantitative real-time PCR for the candidate genes, i.e., C3 and CFH, in the peripheral leukocytes showed an upregulation of both C3 and CFH genes (FC-4.5 ± 0.8; * p = 0.04 and FC-7.09 ± 1.1; *p = 0.04 respectively) in the patients with non-infectious posterior uveitis as compared to controls (Figure 3).