Figure 4. Variable patterns of infection in direct and respiratory contact animals.

Naive ferrets were placed in direct contact (n=3) or respiratory contact (n=2) with inoculated donor animals 1 d.p.i. Upper respiratory and lung bioluminescence was imaged every 48 h.p.i. through 14 d.p.i. Imaging ended when viral clearance was obtained as monitored by both luminescence and viral titre determination. Arrows indicate areas of interest where luminescence was detected.