Read a bit how the Chinese believe that blood is like vital essence - donating blood is considered basically giving up some of your vital life force, never to be replaced. This led to a situation where rural villages were basically forced to donate blood, while wealthy dying folks were being given blood transfusions that did nothing, except make them feel a little better...

Now with the spectre of HIV transmission from dirty donation equipment, you can bet it will be even harder to talk 'em into donating it. Why we need an artifical blood ASAP.