The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies.People with type O have both anti-A and anti-B antibodies.BO blood type system. The ABO system consists of A, B, AB, and O blood types. People with type A have antibodies in the blood against type B. People with type B have antibodies in the blood against type A. People with AB have no anti-A or anti-B antibodies. People with type O have both anti-A and anti-B antibodies.
Staying in one position for any length of time increases the risk that the lower legs, feet, or hands will swell because body fluid will normally move down a limb from the effects of gravity. Swelling can also be caused by heat-related problems, such as heat edema from working or being active in a hot environment.
A fever and sore throat are usually the first symptoms of hand, foot, and mouth disease. The characteristic blisters and rashes show up later, usually one or two days after the fever begins. Hand, foot, and mouth disease is often caused by a strain of coxsackievirus, most commonly coxsackievirus A16. The coxsackievirus is part of a group of viruses called Enteroviruses. In some cases, other types of Enteroviruses can cause hand, foot, and mouth disease. Viruses can be easily spread from person-to-person.