True statement about rheumatization of MV -

Mitral stenosis is a narrowing of the mitral valve opening that blocks (obstructs) blood flow from the left atrium to the left ventricle. Mitral stenosis usually results from rheumatic fever, but infants can be born with the condition. Mitral stenosis does not cause symptoms unless it is severe Mitral valve stenosis Usually a childhood disease, rheumatic fever results from the body's immune response to a streptococcal bacterial infection. Rheumatic fever is a serious complication of strep throat or scarlet fever. The organs most affected by acute rheumatic fever are the joints and the hea Ref Davidson edition23rd pg 450