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At a news conference held by the State Council's joint prevention and control mechanism on Sunday, Lin Wei, an official at the General Administration of Customs, said that it has adopted strict measures on entry-exit epidemic control including requiring to submit a declaration of health to screen people with epidemic symptoms.
At least 3,000 people were used for human experimentation by Unit 731and more than 300,000 people across China were killed by Japan's biological weapons.
Ascher explained that these mutations can affect the ability of vaccines and drugs to bind the virus or create a specific immune response against it.
At least seven people, including security personnel, were wounded in the attack, and were shifted to a nearby hospital.
At least one case is now part of a broader Chinese police investigation.
来源：资阳报