New measures for countries importing pork into China are not trade protectionism but merely providing assurances that the H1N1 virus will not be brought into China through food, said a top official.

Yu Taiwei, director of the food import and export bureau under the General Administration of Quality Supervision, Inspection and Quarantine (AQSIQ), explained that pork imports must be proven not to contain any H1N1 virus.

"China attaches great importance to stopping the spread of the H1N1 virus," said Yu. "We don't want any virus to spread in our country, and we don't want any virus to come into our country through food."