The CDC has reported two more deaths in children who were infected with enterovirus D-68 (EV-D68), and a related CDC investigation has revealed another six unexplained polio-like illnesses in children.

The number of deaths in patients who tested positive for EV-D68 has reached 11, up by 2, the CDC said in an update today. Also, the national tally of EV-D68 infections increased by 4, to 1,116. The infections involve severe respiratory illness, nearly all of them in children.

The CDC has not released any findings on the role EV-D68 played in the 11 deaths, saying state health departments are investigating those cases. But in early October, New Jersey officials said the virus caused the death of a 4-year-old boy who died in his sleep.