China blasted Covid19 testing requirements imposed on passengers from China and threatened countermeasures against countries involved, which include the US and several European nations.

“We believe that the entry restrictions adopted by some countries targeting China lack scientific basis, and some excessive practices are even more unacceptable,” foreign ministry spokesperson Mao Ning said at a daily briefing on Tuesday.

“We are firmly opposed to attempts to manipulate the Covid measures for political purposes and will take countermeasures based on the principle of reciprocity,” she said.

Australia and Canada this week joined a growing list of countries requiring travellers from China to take a Covid-19 test prior to boarding their flight, as China battles a nationwide outbreak of the coronavirus after abruptly easing restrictions that were in place for much of the pandemic.

Other countries including the US, UK, India, Japan and several European nations have announced tougher Covid-19 measures on Chinese travellers amid concerns over a lack of data on infections in China and fears of the possibility that new variants may spread.

China, which for most of the pandemic adopted a “zero-Covid” strategy that imposed harsh restrictions aimed at stamping out the virus, abruptly eased those measures in December.

Chinese authorities previously said that from January 8, overseas travellers would no longer need to quarantine upon arriving in China, paving the way for Chinese residents to travel.