Viral titers in collected specimens from each group of ferrets. Specimens (fecal, nasal washes, saliva, and urine) were collected for 12 days, and blood samples were collected for 10 days (once every 2 days). All specimens from directly infected ferrets (A), and the serum (B), fecal (C), nasal washes (D), saliva (E), and urine (F) of direct contact (DC) and indirect contact (IC) ferrets were titered using real-time polymerase chain reaction. Blue circles and green triangles represent DC and IC ferrets, respectively. Each experiment was performed 3 separate times. The number indicates a reduced number of samples collected due to death of ferrets in this group. Data are presented with the horizontal dotted line as the minimum values (0.2 log10 copies/mL) observed.
