Fig. 4.

Clinical protection in vaccinated ponies after virulent virus challenge. Clinical signs were monitored from day 36 onwards. (A) Clinical signs were scored for vaccinated groups A and B (up to 18 days) and control group (up to 10 days) (upper, middle and lower panels, respectively). (B) Severe clinical signs after challenge in both control animals were evident as oedema of the eyelids and supraorbital fossae (left) and conjunctivitis (right).