Figure 4

Virus neutralising titres observed in nasal secretion samples from vaccinated animals in groups 2–4 at a range of time-points. The arrow above each graph indicates the timing of challenge for that group. Samples from animals in group 2 (panel A) are represented by squares, group 3 (panel B) by triangles and group 4 (panel C) by circles. Filled symbols represent animals that succumbed to MCF while open symbols represent animals protected by vaccination.