The Ohio Department of Agriculture added hand washing stations and signs warning people not to bring food or drinks into the swine barn at the Ohio State Fair.
The warnings come after 41 people, all but two of them children, were infected with a type of influenza after contact with pigs at the Butler County Fair last week.
Butler County Health Director Patricia Berg told 10TV News that nearly everyone who was sick was involved with caring for the animals. That health department was alerted after an infection control expert at a hospital noticed two people with influenza when it is not flu season.
Berg said that pigs get flu just like people, and can pass along the virus. She added that fairgoers should not worry about getting sick.
Nasal swabs of ten victims have tested positive at the state health lab, so samples have been sent to the Centers for Disease Control for investigation.
The C.D.C. will check to see if this outbreak is linked to similar cases in Indiana and Hawaii.
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