US lifts HIV/Aids immigration ban
The US has lifted a 22-year immigration ban, which prevented anyone with HIV/AIDS from entering the country.
The ban was imposed at the height of a global panic about the disease at the end of the 1980s.
In lifting the ban President Obama said it was not compatible with US plans to be a leader in the fight against the disease.
The new rules took effect today and the US is planning to host a bi-annual global HIV/AIDS summit for the first time in 2012.
The BBC correspondent in Miami, Charles Scanlon says improving treatments and evolving public perceptions have helped to bring about the change.