A woman in her 70s is Minnesota's 11th confirmed case of fungal meningitis.
The Minnesota Department of Health is not releasing any other information about the case, which is linked to contaminated steroids from a Massachusetts pharmacy.
The U.S. Centers for Disease Control and Prevention says the risk of developing fungal meningitis begins to taper off around 42 days after receiving a contaminated injection. That's about how long it has been since the last tainted shots were given to patients in Minnesota.
But Health Department spokesman Buddy Ferguson said the CDC also warns there may be exceptions.
"Frankly, we really don't know how long the window is potentially on this," Ferguson said. "It is again a rare disease; something we haven't seen before and we're still learning about it."
Nationwide, more than 400 people have been infected with fungal meningitis. Thirty people have died.