why more difficult to donate blood when they have a shortage?

I hear ads asking for more blood donors every day but they are making it more & more difficult to donate blood. I used to donate but now they don’t want it ‘cos I’ve visited Thailand.
Im sure I could get tested for malaria or my blood could, BUT… if I was in danger of dying [...]

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Does anyone know the life span of donated blood & the best methods to keep it save & not destroy its quality ?

Such as what the best temperature, condition, container,..to keep it save & unaffected.
What is the best refrigerating temperature for it ?
i always ask these kind of questions when i am giving blood and if i remember correctly it only last for like 4 days – they keep it in vinyl bags in a fridge until [...]

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