Figure 4. Lymph node swelling over time in Septavacc and control ponies.

Lymph node swelling was monitored from three days pre-challenge (day 85) using an arbitrary scale from 0 to 4. Average values and SEM are shown. The insert shows number of days each pony was considered positive, i.e. with a value exceeding 2. P-value in insert: *p = 0.05. Non-vaccinated (open symbols) (n = 7) and Septavacc vaccinated (closed symbols) (n = 7).