Officials are calling it the largest theft of flu vaccine in the United States.
It happened in Merced this week: nearly a thousand doses of flu vaccine were taken from the Merced Faculty Associates Medical Group, and it represented a quarter of the official supply in Merced.
Even if the doses are recovered, they´ll be considered tainted and unusable.
The stolen vaccine is likely on its way to the black market, according to police officials.
News accounts report that doses are selling for as much as 175 dollars per shot on the illegal market, compared to 10 or 20 dollars at clinics and hospitals.