With its white sand, sunny blue skies and cashew nut trees, Miramar Beach in the port city of Beira, Mozambique, has all the right ingredients to draw tourists from all over the world.

But that is not all this idyllic coastline attracts. 'The beach is fertile ground for the spread of the [HI] virus, because so many people's paths cross there,' said Victoria Machava, who works for the Beira municipal health department.