Most deaths will have occurred in the June heatwave, experts say, when a rare red heat alert was issued.
Ndodana Mkhanyisi Tshuma is in court after being arrested in Johannesburg.
The UK medicines regulator has given approval for an experimental vaccine to be tested on healthy adults.
Calls have grown to deport Rochdale grooming gang ringleader Shabir Ahmed after his release from prison.
Police say they are not looking for anyone else after a 28-year-old man was arrested in Rotherham, South Yorkshire.