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.
The Rh factor is a type of protein on the surface of the red blood cell. Most people have the Rh factor in their blood (Rh-positive) but some people do not (Rh-negative). During pregnancy, problems can arise when the mother is Rh-negative and the fetus's blood has the Rh factor, inherited from the father. When a woman with Rh-negative blood is exposed to Rh-positive fetal blood, the body begins to develop antibodies in response to the Rh antigens in the fetusâ blood.