Ventura County officials are endeavoring to contact thousands of patients who have received vaccines that may have been ineffective because county workers have stored them at the wrong temperature.
About 23,000 patients who received strokes in county clinics between October 2017 and November 2018 need to be revaccinated, county officials said. But so far, less than 5% of those affected have returned to get their shots, raising questions about how residents will be protected from this year's flu season and other disease outbreaks.
In October 2017, Ventura County officials changed packaging process to ensure that vaccines traveling from the Ventura office to the furthest Simi Valley clinics do not become dangerously hot.
Most vaccines must be stored at 35 to 46 degrees Fahrenheit, according to the US Centers for Disease Control and Prevention.
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