The number of blood donations has increased slightly, the South African National Blood Service said yesterday.
Spokesman Nicolette Duda said Group O blood stock grew from a one-day supply to two-days supply.
There is a need for blood supply of four to five days, she said.
"We are making a special appeal for new blood donors between the ages of 16 and 65, who weigh 50kg or more and lead a sexually-safe lifestyle.
For information, call 0800-11-9031. - Sapa