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From New Yorker

From Vox

Without adequate information about vaccine efficacy, infections, hospitalizations, and deaths, it’s difficult to model how the disease might spread and make sensible policies around disease mitigation — hence the patchwork of air travel restrictions now.

“We’re flying blind without more information, but that’s also an issue we’re facing in the US as the CDC changed community transmission level thresholds, testing centers were closed, and at-home tests are not reported,” Popescu said. “Ultimately this should be a lesson in that we can’t truly address an outbreak or pandemic if data is incomplete anywhere.”

Just as in the beginning of the pandemic, countries aren’t in agreement in how they’ll deal with potential new cases coming in via air travel; three years later, Popescu said, the countries that do impose restrictions aren’t necessarily choosing effective ones. “Even [in the beginning of the pandemic] a travel ban was not backed in science and frankly proved to be ineffective in control.” The best travel restrictions can do with a disease of this magnitude is buy governments time to prepare for its spread.

Italy, which has in place a testing restriction for air travelers from China, has encouraged other European Union countries to do the same; France and Spain have implemented restrictions too, but the EU overall has thus far declined to do so. In a place like Europe where travel overland between countries is fairly painless, “testing passengers from one country is not effective in disease containment (the horse is out of the barn essentially),” Popescu said. Furthermore, she said, “testing is reactive,” not proactive, she said — Italy implemented its testing mandate after cases were detected in flights arriving in Milan on December 26.

One positive sign from Italy’s testing program is that there don’t seem to be new variants coming in from China — meaning as far as researchers can tell, Covid-infected travelers from China don’t pose any greater risk to, say, the US population than an American citizen infected with Covid-19 does.

The risks are possibly higher for Chinese travelers, who might be introduced to an unfamiliar variant during their travels, or might not be vaccinated, though around 91 percent of the population fully vaccinated, according to the New York Times.

Though the world is better equipped to manage Covid-19 than in 2020, the patchwork of restrictions in response to China’s re-opening still shows major flaws in the world’s ability to deal with the pandemic in a united, consistent manner, Popescu said. Covid-19 is likely to be endemic for years to come; incidents like China’s re-opening and the potential for new disease variants and waves “should be a reminder of the importance of global health, vaccine equity, and partnerships in proactive public health interventions.

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