Mustang Marine. As a prior enlisted Marine, our favorite officers were the mustangs. All that term means is prior enlisted. The reason a lot of people prefer them to fresh new butterbars out of college is that the mustangs have experience as an enlisted and, now, usually in war time scenarios.
What causes disease? Injury, infection or an unhealthy lifestyle can all make you ill. So can your genes, the instructions that tell your body how to make all the different proteins it needs to survive and grow. A change in a gene may cause a change in a protein, affecting the way it works in your body. Some genes are involved in common illnesses, while others cause rare genetic conditions.
Primary bacterial diseases are caused by invasion of bacteria that cause disease with no other predisposing factors. Secondary bacterial diseases are caused by invasion of bacteria after a predisposing condition, such as viral infections, stresses, tissue injuries, and dietary upsets.A bacterial disease may affect a single tissue or organ, or it may affect multiple tissues and organs of the animal.iruses often infect specific types of cells causing damage to the tissues or organs that those cells make up. Similar to bacte-rial disease, viruses can be found in the bloodstream, which is called viremia. Viruses are causative agents of many types of animal diseases.