Several countries - including the US, Japan, Italy and Malaysia - are now enforcing testing on visitors from China following the effective ending of Beijing's zero-Covid policy,
But do such restrictions work?
Professor Andrew Pollard, director of the Oxford Vaccine Group told BBC News: "Trying to ban a virus by adjusting what we do with travel has already been shown not to work very well.
"We've seen that with the bans on travel from various countries during the pandemic, that hasn't stopped those viruses travelling around the world eventually."
The word "eventually" is important here, because studies suggest that travel restrictions tend only to delay the spread of the virus spreading in a country, but cannot keep it out completely.
A report in the British Medical Journal found that international border restrictions could delay the spread by two months.
One of its authors, Dr Karen Grepin from Hong Kong University, told Reality Check: "We have learned during the pandemic that universal measures, applying to all travellers not just those from certain countries, are more effective than targeted measures, for example against Chinese travellers.
"The only type of travel restrictions that have been shown to be effective during the pandemic are those that involve lengthy quarantine periods and I don't think there is a lot of appetite for such measures at this point."
Research published in the journal Nature, in December 2020, said restrictions worked well as Covid first began to spread around the world, but became less effective the later they were introduced.
A study by the WZB Berlin Social Science Center in Germany looking at travel restrictions and death rates in more than 180 countries reached similar conclusions and added:
* the biggest impact was when countries banned travel before recording 10 or more deaths
* quarantine for all travellers was more effective than entry bans (which in some cases exempted returning nationals).
Another scientist advising the UK government, Prof Mark Woolhouse, told Reality Check that restricting arrivals from China to the UK would not do much to limit the number of Covid cases in this country.
"We have far too many Covid-19 cases here in the UK at present for imported cases to make a significant contribution," he said.
It has also been suggested that restrictions would prevent potential new variants of Covid reaching the UK.
However, if there is such a variant, said Prof Woolhouse, travel restrictions would be too late.
"It will almost certainly have got here already," he said,
"Measures could only work if the variant happens to emerge during the period the measures are in place and even then they will only delay, not prevent, the arrival of the variant."
Besides, a new variant is not more likely to come in from China than from anywhere else in the world.
"Though China is clearly experiencing a substantial wave there is no reason to suspect that wave will be a crucible for the emergence of new variants," said Prof Woolhouse.
"The next variant is at least as likely to emerge from somewhere entirely different - there are currently around four million reported cases per week worldwide (and surely far larger numbers are unreported). So why concentrate only on China?"
However, the WHO has said it is concerned that China is not sharing information about its latest Covid surge, possibly including the emergence of any new variants.
"Targeted border measures against China may be more of a political statement in response to lack of information-sharing than a sincere attempt to promote public health," said Catherine Worsnop from the University of Maryland's School of Public Policy.