MICG and infection: In addition, European O. pajunii infections are much less pronounced in the hepatic caeca of the host than in the main midgut epithelium (49), and O. colligata frequently develops intensively in the caeca (49); in contrast, MicG infects the caeca as frequently as the midgut epithelium, and the intensity of the infection can vary temporally between the two parts of the host’s gut.