INDEPENDENCE DAY. On July 4, 1776, the thirteen colonies claimed their independence from England, an event which eventually led to the formation of the United States.
Polycythemia vera is a rare, chronic disorder involving the overproduction of blood cells in the bone marrow (myeloproliferation). The overproduction of red blood cells is most dramatic, but the production of white blood cells and platelets are also elevated in most cases.
Types of polycythaemia. Primary polycythaemia: In primary polycythaemia the increase in red blood cells is due to inherent problems in their production. Secondary polycythaemia: Secondary polycythaemia generally occurs as a response to other factors or underlying conditions that promote red blood cell production.rimary polycythaemia: In primary polycythaemia the increase in red blood cells is due to inherent problems in their production. Secondary polycythaemia: Secondary polycythaemia generally occurs as a response to other factors or underlying conditions that promote red blood cell production.