Figure 4

Protective efficacy of H7N9/AAca in ferrets.

Ferrets were challenged with 10⁵ EID₅₀ of rAH/1 three weeks after being inoculated with different doses of H7N9/AAca or PBS. Organs were collected on day 4 post-challenge for titration in eggs. The dashed lines indicate the lower limit of detection. a, P < 0.05; b, P < 0.01 compared with the corresponding value for PBS (mock)-inoculated animals.