试题详情

共用题干 AIDS

The World Health Organization(WHO)says as many as 10 million persons worldwide
may have the virus that causes AIDS（艾滋病）.Experts believe about 350, 000 persons
have the disease.And one million more may get it in the next five years. In the United
States,about 50,000 persons have died with AIDS.The country"s top medical official
says more than 90 percent of all Americans who had the AIDS virus five years ago are
dead.
There is no cure for AIDS and no vaccine（疫苗）or medicine to prevent it. However,
researchers know much more about AIDS than they did」ust a few years ago.We now know
that AIDS is caused by a virus.The virus invades healthy cells,including white blood cells
that are part of our defense system against disease.It takes control of the healthy cell"s
genetic material and forces the cell to make a copy of the virus.The cell then dies.And the
virus-caused particles move on to invade and kill more healthy cells.
The AIDS virus is carried in a person"s body fluids.The virus can be passed sexually or
by sharing instruments used to take intravenous（进入静脉的）drugs. It also can be passed
in blood products or from a pregnant woman with AIDS to her developing baby.
Many stories about the spread of AIDS are false.You cannot get AIDS by working or
attending school with someone who has the disease.You cannot get it by touching drinking
glasses or other objects used by such persons.Experts say no one has gotten AIDS by
living with,caring for or touching an AIDS patient. America has the largest number of AIDS patients in the world.