A Framingham compounding pharmacy has been identified by state and federal health officials as the source of a medication being investigated as a possible cause of an unusual fungal meningitis outbreak that has sickened 26 patients in five states who received steroid injections. Four of the patients have died.

The pharmacy, New England Compounding Center, recalled three lots of methylprednisolone on Sept. 26, according to the US Food and Drug Administration.