Aysah Assefa and Haji Mohamad Toha live about an hour's walk apart. Ms Aysah's husband - an imam and a farmer - died four years ago.

"Sheikh Mohammed advised me to get tested when my husband died. I felt insulted at first… When my health deteriorated, I decided to get tested."

She was diagnosed as HIV-positive.

"He visits me at home once or twice a week, to ask how we are doing, and to make sure that I am taking my medicines. I see him like a father."