Haiti. Conversely, many new HIV infections in Mexico can be traced back to the United States. People infected with HIV were banned from entering the United States in 1987 by executive order, but the 1993 statute supporting the ban was lifted in 2009. The executive branch is expected to administratively remove HIV from the list of infectious diseases barring immigration, but immigrants generally would need to show that they would not be a burden on public welfare. Researchers have also found what is known as the "healthy immigrant effect", in which immigrants in general tend to be healthier than individuals born in the U.S. Immigrants are more likely than native-born Americans to have a medical visit labeled uncompensated care.