More children have been diagnosed with a mystically paralyzed disease in recent weeks, and the health authorities in the United States are still not sure about the cause.
This year's bill can outweigh the same outbreaks recorded in 2014 and 2016, officials said. Disease is still rare: 90 cases have been reported in 27 states, according to Centers for Disease Control and Prevention (CDC).
It is still unknown which causes some children to lose the ability to move their face, neck, back, arms or legs. Symptoms usually occur approximately one week after the child has a fever or respiratory disease.
Health authorities refer to the condition as acute weak myelitis. No one has died of the disease this year, but they say that at least half of patients do not recover from paralysis and difficult complications.
The Polio and West Nile virus were discarded. Doctors suspect that the cause may be some type of enterovirus, which in most people causes cold symptoms.
The first wave of mysterious cases in 2014 coincided with a generalized increase in diseases related to an enterovirus called EV-D68.