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Oct , 10 · Rh negative blood is very rare and there are pros and cons to having this blood type As I mentioned above, having Rh negative blood can cause problems during pregnancy for the mother and child But it isn't necessarily all bad One idea is that Rh negative people may be resistant to some of the effects of the parasite Toxoplasma This parasiteThat marker is known as the Rh factor and its presence determines if the blood is positive and negative So, if the Rh factor is present, the blood group is positive, and if there is no Rh factor in the blood, the blood group is negativeMay 17, 21 · However, people with type O blood can receive only type O blood When it comes to the Rh factor, people with Rhpositive blood can receive either Rhpositive or Rhnegative blood, while people Can Two Rh Positive Parents Have An Rh Negative Child Ab rh negative blood type facts