Fig. 2: Modulation of interferon-γ (IFNG) gene expression following stimulation of pre- and post-vaccination blood samples with recombinant (r) EE2 or major capsid protein (MCP) vaccine antigens (Ag).

The longitudinal IFNG gene expression levels in samples stimulated with rEE2 or rMCP relative to the expression in time-matched phosphate buffered saline (PBS)-treated controls over the stage I (a, b) and stage II (c–f) study periods are shown for the three participating elephants (N = 3). Data are presented for each individual animal (stage I: n = 1; stage II: n = 2). Vertical dashed lines indicate time of vaccination with either rMVA-EE2-MCP virus vector (rMVA) or adjuvanted rEE2-rMCP-subunit (rAg) formulation. Horizontal dashed lines mark the highest IFNG expression level observed among baseline (pre-vaccination) samples. Through calculating the fold changes using the 2−(ΔΔCt) method, IFNG mRNA levels were normalised to those of the reference gene elongation factor−1α and PBS controls were set as 1. Asterisks below the trial week numbers indicate that a blood sample could not be obtained from an animal at this time point (elephant C: weeks 3 and 16) or samples that were excluded from further analysis due to unsatisfactory downstream quality checks (elephant B: weeks 13, 16 and 20). Source data are provided as a Source Data file.