MONTPELIER (AP) - The Vermont Agency of Agriculture says the state has seen its first case of a virus affecting pigs that is spreading across the country.

Porcine Epidemic Diarrhea virus was confirmed in a swine operation in Rutland County on March 26.

The virus does not make people sick and it does not affect other species of livestock. Officials say the pork remains completely safe to eat.

The virus was first detected in the United States about a year ago. Since then it has been reported at more than 4,000 premises in 27 states.

It kills nearly all piglets that have not been weaned.

Officials say farmers should work with their veterinarians to prevent the virus from reaching their herds.