Salmonella sppSay no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an Original Essay The immune system is built to defeat any bacteria that may pose a threat to the body. However, salmonella knows when it enters the host's body and can change its behavior to confront our immune system and cause infection and spread throughout the body causing disease. The immune system is built to detect any type of bacteria, then digest and kill it. When the bacteria enter the host body they will come into contact with two lines of defense of our immune system. The first line will be the innate immune system which will be immediately ready to fight the bacteria and prevent its spread. The second line that the bacteria will encounter in our body is called the adaptive immune system, which may take a few days to develop, however, when it is fully developed it sends out T cells to recognize the type of bacteria. Once it recognizes which bacterium it is, it allows it to memorize it for future infections, then attack it and consequently kill it. Mycobacterium bovis If the mycobacterium has entered the body by inhaling the infected droplets, the alveolar macrophage will be the first phagocytic. cell involved in killing mycobacteria by fusion of phagolysosomes. If the cell manages to invade and kill the bacteria, no infection will occur. However, if the cell is defeated by the mycobacterium, the animal will become infected and develop the exposed disease. When this happens the dendritic cells and monocytes will try to stop the infection by taking part in the phagocytic process. In fact, the macrophage cell is one of the cells preferred by mycobacteria, but at the same time it is also responsible for the control and destruction of these pathogens. Microsporum canisWhen microsporum canis has infected the organism, the first line of defense that it will encounter in our body as a form of immune system is a non-specific immunity that contains mechanisms that build an immediate natural barrier. It will also encounter a local defense mechanism that contains: unsaturated transferrin, phagocytosis by polymorphonuclear leukocytes and medium-chain fatty acids produced in sebum. Then the fungi will encounter T cells that help B cells kill the infected cells. However, the cell-mediated immune response has the main role in fighting the fungi with a positive result. Aspergillus spp If the host has compromised immune system, what may be caused by immunosuppressive therapy before organ transplantation or there is pre-existing lung malfunction which may be caused by asthma, cystic fibrosis etc. fungi exploit those weaknesses that can cause saprophytic, allergic or invasive aspergillosis. The innate immune response should prevent conidia from developing and forming invasive hyphae that can penetrate lung tissues. However, if the innate immune response is unable to prevent conidia from developing anatomical barriers such as the mucociliary elevator, professional phagocytes and neutrophils will halt fungal development by inhibiting the growth of conidia and hyphae. Canine parvovirusWhen the host gets infected by canine parvovirus, the immune system recognizes the virus antigen and begins to produce IgG and IgM antibodies that are specified in the virus antigens. By producing these antigens, the immune system is ready to attack the virus to prevent it from reproducing in host cells and infecting the organism. Rabies virus The rabies virus is one of the viruses that manage to hide from the immune system..