(CNN) More children have been diagnosed with acute flaccid myelitis, the polio-like paralyzing illness, according to numbers released Monday by the US Centers for Disease Control and Prevention.

There have now been 106 confirmed cases of AFM in 29 states this year, according to the CDC, an increase of 16 since last week.

There are also 167 possible cases of the illness, an increase of five from the previous week.

Since 2014, there have been 430 confirmed cases of the rare disease, and 90% have been children, according to the CDC.

AFM is a rare illness that affects the nervous system, especially the gray matter in the spinal cord, and causes muscle weakness and sudden onset of paralysis. There's a spectrum of how children can be affected: Some regain the use of their paralyzed limbs, while others are paralyzed from the neck down and can breathe only with the help of a ventilator.

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