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Our blood is red because of something called haemoglobin, which helps carry oxygen around our bodies.
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Lots of people report bruising easily. What do doctors look for to see if it might be caused by something serious?
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Of the 20 million people living with sickle cell disease globally, more than 66% are in sub-Saharan Africa.
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If you have risk factors around blood clots, heart attack or stroke, this should actually be an impetus to get vaccinated sooner rather than later.