MPO and infection: E challenge infection of the serum-recipients, the comparison of body weight, clinical sore, chlamydial load in the lung, MPO, TNF-α, or IFN-γ (Figure 10a–f) between the different groups did not show any significant effect caused by the transferred two 5cVAC-specific hyper-immune antisera-irrespective of whether these sera were raised by i.n. or by s.c. application of the vaccine.