<prompt> For diagnosis of acute rheumatic fever, essential feature isPrior history of rheumatic feverRecent sore throat infection1 major and 2 minor criteriaErythema marginatum  <response>: The diagnosis, according to the revised Jones criteria, is based upon two or more major manifestations, or one major and two or more minor manifestations; evidence of preceding streptococcal infection is also required.JONES CRITERIA FOR THE DIAGNOSIS OF RHEUMATIC FEVERMajor manifestationsCarditisPolyathritisChoreaErythema marginatumSubcutaneous nodules Minor manifestationsFeverArthralgiaPrevious rheumatic feverRaised ESR or CRPLeucocytosisFirst degree AV block PLUSSupporting evidence of preceding streptococcal infection: recent scarlet fever, raised antistreptolysin 0 or other streptococ-cal antibody titre, positive throat cultureN. B. Evidence of recent streptococcal infection. 