All pigs must pass a mandatory flu exam after the Monroe County Fair closed its pig barn because some swine had flu-like symptoms.

With the swine flu going around in Indiana, state animal health officials are checking every pig to protect them, their handlers and the public.

Exhibitors from across Indiana arrived and unloaded their best swine at the state fairgrounds' swine barn Wednesday, where 2,000 pigs will be housed.

Courtney Reynolds, 15, brought three pigs to the fair.

"You work up for this... this entire year and the show day is only in one day, so it's a big thing to be out there. And if you win, it's fun," Reynolds said.

But swine flu is threatening to spoil the fun.

Pigs across the state have come down with flu-like symptoms, and it only takes one infected pig to cause an outbreak.

Vets say taking an animal's body temperature is the best way to diagnose the virus.

They'll quarantine any pig with a body temperature over 105 to give them a chance to cool off after the ride here.

"It's awful hot in the trailers, and they re-tested them a second time. And then they determined if they can come into the fair or not," Mike Reynolds said. "But we had no issues."

So far all the swine arriving at the fairgrounds passed the exam and were allowed access to the swine barn.

Officials said visitors to the barn should wash their hands after touching the animals, and avoid eating their fair food around the animals.

"The particular virus we're concerned about this year is one that can be shared between pigs and humans, and they can go either way," said Doctor Bret Marsh, with the Indiana State Board of Animal Health. "So as long as we have a healthy pig population, we hope to be preserving public health as well."

This type of flu bug is a respiratory virus and cannot be transmitted by eating pork, ham or bacon.