<prompt> Answer this question truthfullyWhat are some of the indicators that suggest a person has had a prior group A β-hemolytic streptococcal infection?  <response>: <reason> What are some of the indicators that suggest a person has had a prior group A β-hemolytic streptococcal infection? Evidence of prior group A β-hemolytic streptococcal infection includes elevated anti-streptolysin O ASO or anti DNase B titers. 