Figure 2.

Acute CSFV infection with moderately virulent strains. The incubation period in most cases is from 7 to 10 days. Atypical clinical signs range from one to two weeks. Typical clinical signs occur around 2 to 4 weeks. The convalescent period is from 3 to 4 weeks. Death can occur as late as five weeks post-infection. (a) Swine are huddling, 10–15 days post-infection; (b) swine are presenting with hunched back; (c) severe conjunctivitis; (d) severe cyanosis of the skin around the face, ears, and limbs; (e) neurological signs, swine was unable to stand; and (f) dead swine with classic cyanosis of the ears.