(Reuters) - the rarest, polio-like situation has taken 116 people in the United States so far this year, the largest number of cases since 2016, said on the first day of the week USA centers for disease control and prevention.

CDC officials said, in fact, that they do not understand, in fact, what causes acute sleepy myelitis or AFM, which affects the nervous system and causes powerlessness and including paralysis in one or more limbs. The overwhelming majority of patients are children.

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In 2014, when 120 patients were diagnosed, the CDC began investigating cases that it estimated affected 1 in 1 million people in the United States.

Since 2014, the number of cases quickly jumped any 2 years in the US. Last year, the country had 33 proven options, and in 2016-149.

“It's enough for this, in fact that it is increasing, and we still have not checked how to directly prevent it or how to treat it,” said Dr. Emmanuel Tiongson, a pediatric neurologist at the children's clinic of Los Angeles, who considered and cured patients with this disease, said in a telephone interview.

The times of the phenomena that scientists looked at is the disease, the more common in the August to October phase, the stage where almost all microbes tend to circulate, according to the CDC.

The disease has the ability to spread through the infection, in fact that explains why in some States there were clusters of cases, said Tiangson.

The CDC on the first day of the week gave a breakdown by state of cases for the first time in a given year.

Colorado claimed 15 proven cases and Texas 14, Pennsylvania, Ohio, Washington and Minnesota, where at any rate there were 8 cases, according to the CDC.

States with a tremendous public or not bad ways to report the disease more often have a larger number of cases, according to the CDC.

In some patients, selective paralysis, they suffer because of the disease will become an indefinite situation, said Tiongson.