AFAIK, there is no vaccine for Enterovirus D-68 (EV-D68).
There is also no real evidence I’ve seen of a link between these cases and the immigrant “children.”
Perfectly willing to accept that there is a link, just would like to see evidence of one.
At the time the rare disease caseload skyrocketed over a wide geographic area in a very short period of time, the only real vector was the distribution of large numbers of illegal immigrant children who had been given little, if any medical screening over that same area.
It is highly unlikely that all those (US) children had had something in common to cause exposure to a rare virus at the same time.
Instead of the American kids going to the virus (a common point source), it is more likely the virus was distributed to them.
For those who will not bother with the link, the following quote from the article I linked shows the significance of the increase in the number of cases:
It is true that EV-D68 has been in the U.S. at least since 1962. But according to a study done by doctors from the Division of Viral Diseases at the National Center for Immunization and Respiratory Diseases published on the CDC's own website, EV-D68 "is one of the most rarely reported serotypes, with only 26 reports throughout the 36-year study period (1970 through 2006)."
The current outbreak, over 47 US States and parts of Canada, represents an increase of over 1000 times previous cases/year.