VA Â» Office of Public and Intergovernmental Affairs Â» History of Veterans Day. World War I â known at the time as âThe Great Warâ - officially ended when the Treaty of Versailles was signed on June 28, 1919, in the Palace of Versailles outside the town of Versailles, France.
If your blood mixes with Rh-positive blood, your immune system will react to the Rh factor by making antibodies to destroy it. This immune system response is called Rh sensitization. Rh sensitization can occur during pregnancy if you are Rh-negative and pregnant with a developing baby (fetus) who has Rh-positive blood.
Approximately 15 percent of the population is Rh negative, and of those, 15 percent are Caucasian, 5 â 8 percent are African American, and 1 â 2 percent are Asian or Native American. Rh factor is not typically a health concern until pregnancy occurs or a blood transfusion is needed. Rh incompatibility is a mismatch between the blood of the mother and the blood of the fetus and occurs when the mother is Rh negative and the fetus is Rh positive. The FDA approved RhoGAM in 1968, and since then it has saved countless lives.