By Denise Roland
The blood business is booming.
This normally obscure trade has been set alight by the race to develop Covid-19 antibody tests, which use blood to tell whether someone has already been infected with the coronavirus. The tests are seen as key to easing lockdowns that have shut down economies around the world.
However, while surging demand has proven a boon for the traders known as blood brokers who source this commodity, diagnostic companies say high prices for the