The Food and Drug Administration officially announced Thursday that the meningitis outbreak is linked to tainted steroid injections produced by the New England Compounding Center. Health officials found a fungus known as Exserohilum rostratum in unopened packages of the steroid, according the FDA’s statement. As many as 14,000 people may have been exposed to the contaminated drugs, which were recalled Sept. 26. More than 250 cases of fungal meningitis and 20 deaths have been reported. The compounding center shut down in early October.