Figure 3. Serological responses in ewes that aborted (includes non-viable births and stillbirths) (-▴-) and lambed (-▪-) following intranasal inoculation with 5×10³ (A; Group 1), 5×10⁵ (B; Group 2) or 5×10⁷ (C; Group 3) IFU C. abortus or intranasally administered negative control inoculum (D; Group 4a; all lambed) (^…x^…) prior to pregnancy, or subcutaneously injected with 2×10⁶ IFU at 70 days of gestation (D; Group 5).

Means (± SEM) of normalised responses (see Materials and Methods) are shown. 100% is equivalent to an OD_450nm of 2.25. The lambing/abortion periods for years 1 and 2 are indicated by the horizontal double-headed arrows. Year 1 only for Groups 4a and 5 (D).