CTSB and infection: Quantification of C. burnetii intracellular replication over 5 days of infection revealed that replication was lower in CTSB-GFP cells than cells expressing GFP alone at day 3 (mean difference 122.9 ± 28.96, p = 0.006) and day 5 (457.1 ± 123.5, p = 0.03) post infection (Fig. 2D).