Beijing is blasting testing requirements on passengers from China and threatening countermeasures against countries involved based on reciprocity.
The Foreign Ministry spokesperson said at a daily briefing Tuesday that China believes the entry restrictions adopted by some countries targeting passengers from China lack scientific basis.
She says some excessive practices are ``even more unacceptable.'' China had abruptly eased strict anti-virus measures in December.
It has since seen a surge in cases.
Since then, countries including Canada, the U.S., U.K., India, Japan and several European nations have announced tougher COVID-19 measures on Chinese travelers.
Many are worried about a lack of data on infections in China and fears of the possibility that new variants may spread.
Canada will require a negative COVID test starting this Thursday for all passengers two years old and up planning to travel to Canada from China, Hong Kong or Macao.