Ten people in Oklahoma wound up in the hospital after being given the wrong medication.
Eight residents and two staff members at Jacquelyn House, a care facility for people with intellectual disabilities, became unresponsive after being injected with insulin instead of the flu shot, reported USA Today.
A licensed pharmacist had been contracted by the facility to administer the annual influenza virus vaccine when the mistake occurred.
According to police, many of the patients that were erroneously given insulin were not able to vocalize what they were experiencing to first responders.
"All these people are symptomatic, lying on the ground, needing help, but can't communicate what they need,"said Bartlesville Police Chief Tracy Roles. "That's why I give a lot of praise to the fire and EMS staff for doing an outstanding job of identifying the problem."
The ten victims were taken to Bartlesville Hospital and most have since been released or will be shortly.
"I've never seen where there's been some sort of medical misadventure to this magnitude," Roles added. "But again, it could have been a lot worse. Not to downplay where we are, but thinking about where we could be, it could certainly have been very, very tragic."
While the pharmacist, who allegedly supplied the medication from a third-party pharmacy, has been cooperating with police, investigators believe it was an accident.
In addition, the group home appears to have been cleared of any negligence in the matter.
"There is no reason to suggest at this point that the facility should have had a reasonable suspicion that this sort of error would occur or be preventable on their part," the Oklahoma State Department of Health said.
Despite the medical mishap, the CDC recommends that everyone age 6 months and older get vaccinated against the flu annually.