How does Duchenne or Becker muscular dystrophy affect the body?

Becker's muscular dystrophy can affect the body in a variety of ways, depending on the person. Becker's muscular dystrophy is caused by a genetic mutation that affects the functioning of a muscle protein called dystrophin. The genetic problems lead to muscle weakness that affects voluntary muscles in the legs, and arms, and can also affect muscles in the heart and respiratory system. This makes people with the disorder more susceptible to complications like infections or heart failure. In some cases, Becker's muscular dystrophy can also lead to learning disabilities if the brain is affected by the lack of properly-functioning dystrophin.

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What is the prognosis of muscular dystrophy (MD)?
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How many people are affected with muscular dystrophy (MD)?
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