Question

One way the body fights invaders is by increasing the body temperature, or running a fever. Give a brief explanation as to why that defensive technique works against some viruses or bacteria.

Answer 1

May be this will help you...

Scientists found that the generation and differentiation of a particular kind of lymphocyte, known as a "CD8+ cytotoxic T-cell" (capable of destroying virus-infected cells and tumor cells) is enhanced by mild fever-range hyperthermia. Specifically, their research suggests that elevated body temperature changes the T-cells' membranes which may help mediate the effects of micro-environmental temperature on cell function.
 To test this, they injected two groups of mice with an antigen, and examined the activation of T-cells following the interaction with antigen presenting cells. Body temperature in half of the mice was raised by 2 degrees centigrade, while the other half maintained a normal core body temperature. In the warmed mice, results showed a greater number of the type of CD8 T-cells capable of destroying infected cells.

Answer 2

T Cells looks for infection in the body. Cytotoxic T cells kills invaders by destroying the cells which is infected with invaders. Cytotoxic T cells have special protein on their body which identifies an virus in the body. These are called T cell receptor. If T cell receptor detects a peptide from a virus, it warns it's stage to its system of T cell infection. The T cell then releases cytotoxic factors to kill the infected cell and, therefore, prevent survival of the invading virus