Why can the onset of aids take several years?

AIDS is Acquired Immunodeficiency Syndrome, the final stage of HIV. It is a chronic and life threatening disease caused by the human immunodeficiency virus or HIV. It attacks and severely weaken the immune system and the human body gradually loses its ability to fight with infections.

The onset of AIDS take several years as HIV destroys the crucial immunity cells of our body known as T cells or CD4 cells. The virus slowly kills the good and healthy cells and weakens the body to such extent that it cannot sustain minor infections also.

integrated circuit (ic) is defined as a set of electronic circuits on one small flat piece of semiconductor material, normally silicon. a functional electronic circuit requires transistors, resistors, capacitors, inductors, etc., and the connections between them.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.