The decision to abandon the World Pork Expo held by the National Council of Pork Producers in Des Moines annually in June indicates growing concerns about the spread of African swine fever in Asia.

According to the National Council, the event usually attracts about 20,000 people over three days, including visitors from China and other countries where the outbreaks occurred.

This week, on April 10, the Paris World Organization for Animal Health announced that an outbreak of African swine fever was detected along with Asian countries and South Africa. American farmers, meat companies, and government officials want to prevent the disease in the United States, because probably close export markets.

"The health of the herd of pigs in the United States is paramount," said David Herring, president of the National Board of Pork Producers and a farmer from Lillington, North Carolina. "Our livelihoods depend on it."

The US government has increased the number of checks for illegal pork products at airports and seaports and has taken measures to combat smuggling to prevent African swine fever.

According to the National Board of Pork Producers, US pork producers are asking Congress to provide funding to another 600 US customs and border inspectors.