NEW YORK (AP) — As many as 13,000 people received steroid shots suspected in a national meningitis outbreak, health officials said Monday. But it’s not clear how many are in danger.

Officials don’t how many of the shots may have been contaminated with meningitis-causing fungus tied to the outbreak. And the figure includes not only those who got them in the back for pain — who are most at risk — but also those who got the shots in other places, like knees and shoulders.