The simple answer to this question is that drafting and re-drafting will help you to write a better essay. A university essay is a complicated piece of work. You need to draw upon a variety of sources and integrate them with your own ideas.
Adaptive immune defenses. The immune response to viral infection comprises innate and adaptive defenses. The innate response, which we have discussed previously, functions continuously in a normal host without exposure to any virus.Most viral infections are controlled by the innate immune system. key feature of the adaptive immune system is memory. Repeat infections by the same virus are met immediately with a strong and specific response that usually effectively stops the infection with less reliance on the innate system. When we say we are immune to infection with a virus, we are talking about immune memory.
The adaptive immune response is more complex than the innate. The antigen first must be processed and recognized.Once an antigen has been recognized, the adaptive immune system creates an army of immune cells specifically designed to attack that antigen.Adaptive immunity also includes a memory that makes future responses against a specific antigen more efficient.hese mechanisms include physical barriers such as skin, chemicals in the blood, and immune system cells that attack foreign cells in the body. The innate immune response is activated by chemical properties of the antigen.