Oddly Occurs most often every 2 yrs ???

Federal health officials took the unusual step on Tuesday of warning the public about an increase in a mysterious and rare condition that mostly affects children and can cause paralysis.

So far this year, 127 confirmed or suspected cases of acute flaccid myelitis, or AFM, have been reported to the Centers for Disease Control and Prevention — a significant increase over 2017 and a worrying perpetuation of a disease for which there is little understanding.

The increase in cases appeared to begin in 2014, when the CDC started tracking the illness. Each year since then, usually in August or September, the CDC has logged a spike in the illness. The spikes were significantly higher in 2014, 2016 and 2018-to-date than in 2015 or 2017. The CDC knows of one child who died with the disorder in 2017.

https://www.washingtonpost.com/health/2018/10/16/paralyzing-polio-like-illness-mainly-affecting-children-confirmed-states-cdc-says/?utm_term=.8a2d8d997bac