11 Fast Facts About Spinal Muscular Atrophy

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  • There are four types of SMA with type 1 being the most severe and type 4 the mildest.
  • Types 1 to 3 develop in childhood and type 4 SMA develops in adulthood.
  • SMA is the genetic disease responsible for the most infant deaths. Those with type 1 SMA do not typically live beyond their second birthday.
  • Children with type 2 and type 3 have good survival rates but most will need a wheelchair from early childhood onwards.

Find out more about the different types of spinal muscular atrophy here.

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