Sitting in his dimly-lit office in the Nigerian capital of Abuja, surrounded by files and boxes of condoms, matchmaker Ugochukwu Michael talks passionately about the part he has played in the marriages of around 100 couples in recent years.

While the popularity of dating apps and websites may make Michael's efforts to play Cupid seem old-fashioned, his matchmaking service stands out from the rest.

All of his clients are living with HIV.