With the global concerns about China's crown disease epidemic, the United States will ask for air passengers from China to show a negative certificate for the test of crown disease.

Bloomberg reported that Federal Health officials said on Wednesday (December 28) that no matter what the passenger's nationality or vaccination status, any passengers who had visited China from China within 10 days before departure must provide nucleic acids or antigen negatives.prove.The new regulations will take effect on January 5.

Officials said that passengers who were positive for more than ten days before departure can provide document proof of displaying rehabilitation as a substitution for negative proof.Airlines must confirm that they have negative proofs or rehabilitation documents before boarding.This requirement is also applicable to passengers from Hong Kong and Macau.

Since the Chinese government has canceled the strict isolation policies of tightly connecting and infected people, coronary virus has spread on a large scale in China.According to the Chinese government's highest health department, the maximum of nearly 37 million people in a single day may be infected with crown disease last week.

In addition, the United States will add two airports participating in the passenger virus genome monitoring plan, and there are seven airports for sample collection related to gene sequencing.The plan covers passengers from hundreds of flights from at least 30 countries.

The above -mentioned officials said that American health experts are particularly worried that new mutant strains that may not be found in China's testing may be appeared.Officials also said that China will continue to pressure China to publish data and virus gene sequences.

Officials point out that in a short time, a large number of people infection will increase the possibility of new mutant plants.China's global database that can track virus variation only provides very little gene sequence data.New mutations may increase the spread or fatal of coronary virus.

With the abandonment of travel restrictions in countries around the world, the US Airport has reduced the detection of coronary virus.However, US health officials said that the collection of gene sequences of voluntary testing and airports is still continuing, and it will further expand in the future to enhance epidemic prevention.

After nearly half of the passengers flying to Milan, nearly half of the passengers were found to be infected, Italy had ordered the test of all passengers from China for compulsory coronary virus.Japan, Malaysia, India and other countries have also strengthened tracking and monitoring measures from Chinese tourists.