Blood types are determined by the presence or absence of certain antigens - substances that can trigger an immune response if they are foreign to the body. Since some antigens can trigger a patient's immune system to attack the transfused blood, safe blood transfusions depend on careful blood typing and cross-matching. Do you know what blood type is safe for you if you need a transfusion. There are four major blood groups determined by the presence or absence of two antigens - A and B - on the surface of red blood cells.
The beautiful country of India is famous for many unique things, such as Bollywood, the Taj Mahal, butter chicken, delicious Indian curry and more. But did you know India is home to some of the most exotic and interesting Indian dog breeds. Most of the indigenous dog breeds in India are quickly heading towards extinction, due to a recent surge in demand for western dog breeds. This trend has led to the over-breeding of foreign dogs and under-breeding of Indian dogs.
The plague has killed hundreds of millions, sweeping across entire countries and bringing civilizations to their knees. Even though we now know more than those who suffered through the biggest outbreak, knowing more about the disease makes it no less frightening. This type is spread only through the bites of fleas and blood contact with the infected insect; there is no way that bubonic plague can spread from one person to another.
Account Options Sign in. Top charts. New releases.