The human organism has average 4-6 liters of blood. The blood transport the oxygen in varies parts of body. Because it’s important know the blood’s groups? What is the difference between the blood’s groups? The Covid-19 to which blood’s groups has a big risk? The great discovery by blood’s groups is made of American  researcher pathologist, immunologist  Karl Landsteiner  in the 1901 year qualifying the blood in three types( A; B; 0), afterwards it’s defined the group AB. In course of years are experimented the transfusion and the transfer of blood from a person at other person. The mortality noted from the first transfusions has been an nightmare for humanity until the discovery of blood’s groups. To can say the win to researcher! What was the study? The win of researcher Karl Landstainer has been known with the prize Nobel in 1930 , that has determined the difference of blood’s groups looking the safety of life. 

The blood, the components

From compositions of blood enter great types of cellules that float in a plasmatic liquid . The difference is the presence or the absence of molecule of protein( something), known as antigens and antibodies . An antigen is localized to surface of protein of  red cellule  instead the antibodies are presents into blood’s plasma. Important is the fact that the person have the varies combinations of that molecules. The great part of blood’s antigens are of glycoprotein nature with the genetic importance. 

The Covid-19 actions  in inferiority the blood’s group 0, instead the people more vulnerable in infection and  to develop the Covid-19 virus are those that have got the A group.