There is no tissue or organ in the body of plants, animals and man in which some parasitic species have not adapted to live. Blood, brain, liver and striated and cardiac muscles, which we are used to in classical microbiology to perceive, a priori, as sterile organs, are in fact often the home of some parasitic species. This ecological idyll often terrifies clinicians and owners, especially when it comes to parasitic species utilizing humans as final, intermediate or potential hosts. The parasites are well adapted to pass the barriers that the body puts in front of other microorganisms, thus creating a bridgehead used by other parasites, viruses, bacteria or fungi. In itself, the presence of hideous lodgers on and in the body does not necessarily cause any harm to the host, and the drive to destroy the “monsters within us” must be carefully weighed. The discovery of organisms’ microbiomes complex systems has changed our understanding of pathogens, and we need to develop a more complex understanding of the “pathobiome,” in which the pathogen is integrated into its abiotic and biotic environment and disease. This especially concerns vector-borne diseases. Today, we already talk not only about mosquito-, fly-, sand fly-, lice-, flea-, tick-, mite-, gastropod- and bug- but also about plant- and fungi-, warm-blooded animal- and even human-borne diseases, each admittedly carries its own pathobiome.