Downey is accused of the murders of Roy JohnBright, Dennis Richard Anthony Daly, Simon Andrew Tipper and Geoffrey Vernon Young, a Crown Prosecution Service statement said.
The NPHS said it was also working with North Wales NHS Trust to provide Ysgol Ffordd Dyffryn and Ysgol JohnBright with vaccination sessions on Friday morning for pupils who have not had two doses of the MMR vaccine.