Muscle weakness is a symptom of a wide variety of mild to serious diseases, disorders and conditions. Muscle weakness can result from infection, trauma, malignancy, autoimmune diseases, and other abnormal processes.
Difference between O+ and O- Blood Group. Key difference: The blood groups O+ and O- are universal donors. The only difference is in the recipients to whom the blood is transfused; O+ can be transfused to any positive blood groups, whereas O- is transfused to both positive as well as negative blood groups. O+ blood group is a common blood group among most of the people.
For transfusions, it is best to match as many blood types as possible, but ABO and Rh are the most important. Type O- blood is the universal donor, while type AB+ is the universal acceptor. Source: Ana Cvejic et al. SMIM1 underlies the Vel blood group and influences red blood cell traits. Nature Genetics.