It is believed that sharks are immune to almost all diseases; they rarely get sick. However, no animal is immune all disease. A disease is technically defined as any deviation from normal, so even a broken bone could be considered a "disease". As for viral/bacterial diseases, no animal is immune to all diseases of that or any other type. Every animal is susceptible to something.
In lupus, as in all other autoimmune diseases, the immune system does not attack itself. Rather, the immune system is confused and attacks health parts of the self such as organs and joints. The exact cause of these diseases is not known. Researchers have identified some genes that are responsible. But even if a person has a genetic predisposition to autoimmunity, it may never develop. Triggers are also involved. Cigarette smoke, the Epstein Barr virus, and sunlight are known triggers in lupus, although others are suspected.
Here's how it works: HIV is the name of a virus that attacks the immune system, makes it weaker. Eventually the immune system fails completely, which makes the person wide open to any and all diseases. The name for when this happens is AIDS. AIDS stands for Acquired Immune Deficiency Syndrome. Meaning your immune system has gotten really weakened. Meaning you catch a lot of other diseases easily. Eventually one of them, or several of them working together, is what kills you.
The animal will exhibit a very poor immune response to the pathogen.Animals raised in axenic environments have immune systems that respond poorly, if at all, to microbial invaders because they haven't been constantly stimulated by the presence of normal micriobiota.Reference from Microbiology with Diseases by Body SystemsThird Edition Robert. W. Bauman
A leukocyte(leucocyte, known as a white blood cell, is a type of cell of the immune system that protects against foreign material and infectious diseases. There are five different types of leukocytes that exist, but they are all produced and derived from a multipotent cell in bone marrow known as a hematopoietic cell.
its important because if we were all the same, we would have the same immune system and everything else. so where as some people can fight off colds and diseases such as breast cancer, if we were all the same then we all may or may not fight off diseases. so in short, if a deadly disease struck and we were all the same, we could all be immune to it, or it could wipe out the entire human race. and a bunch of other stuff...
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