Haemolytic disease of the newborn can occur when ____.
Correct answer D. an Rh-negative mother carries a second Rh-positive foetus after being sensitised
Explanation
During a first birth, Rh-positive foetal cells may enter an Rh-negative mother, who makes anti-D antibodies. In the next Rh-positive pregnancy these cross the placenta and destroy foetal red cells.
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