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.
How common is the Rh-negative factor? More than 85% of people are Rh positive. The Rh factor does not affect a personâs general health. Problems can occur during pregnancy when the babyâs blood has the Rh factor and the motherâs blood does not, however it can be prevented in most cases with the medication called immunoglobulin (RhIg).