In one recent case in Sioux City, Iowa, more than 1,000
families were notified by letter and telephone that their
children needed to be vaccinated again. Officials
discovered that the clinic’s cold-storage unit repeatedly
dropped below freezing during a 17-month period in 2005
and 2006, potentially ruining the stored vaccines. Dr. Ray
Sturdevant, president of the local pediatric clinic, said
that the issue had gone unnoticed.
Poor refrigeration has been blamed for similar problems
elsewhere around the country over the past 2 1/2 years. In
St. Cloud, Minnesota, a clinic had to vaccinate 8,600 patients
again, most of them children. In Lane County, Oregon, 500
children and adults needed another shot. In western Florida,
a similar incident affected about 250 children.