Group O type there is a presence of antibody A and antibody B
and the red cells has no antigen A and antigen B and in terms of
blood component (Packed red cells) it can be considered as safe
"O"(universal ) because of the absence of ag. A and ag B.Increased levels of ASO titre in the blood could cause damage to the heart and joints.
In most cases, penicillin is used to treat patients with increased levels of aso titre.