The President of South Africa says his country will launch an extension of testing and drug treatment for patients infected with HIV. That is the virus that causes the disease AIDS. President Jacob Zuma announced the plan at ceremonies marking World AIDS Day in South Africa. He said that by next April, the country will treat all children younger than one year old who are shown to be infected. He also called for an end to unfair treatment of persons carrying HIV. The United Nations says more than thirty-three million people are infected worldwide. On Monday, American officials said a rule barring HIV carriers from visiting the United States will be canceled early next year.