The head of the World Health Organization has repeated his assertion that China’s zero-Covid strategy is “not sustainable” but added that every country must decide what policy to pursue. WHO director general Tedros Adhanom Ghebreyesus told a media briefing on Tuesday that the highly infectious nature of the Omicron variant required a different approach, after similar remarks week drew sharp criticism from China. “We know the virus better and we have better tools, including vaccines, so that’s why the handling of the virus should actually be different from what we used to do at the start of the pandemic,” he said. Tedros added that the virus had changed significantly since it was first identified in Wuhan in late 2019, when China largely stopped its spread with lockdowns. He said the WHO had repeatedly advised Chinese officials about their recommended Covid-19 containment strategies, but “regarding their choice of policies, it is up to every country to make that choice.” The ruthless and often chaotic implementation of China’s zero-Covid approach has stirred considerable resentment and food shortages in Shanghai, where some residents have been under lockdown for six weeks. WHO emergencies chief Dr Michael Ryan said the agency recognised China had faced a difficult situation with Covid-19 recently and commended authorities for keeping the number of deaths to a very low level. “We understand why the initial response of China was to try and suppress infections to the maximum level (but) that strategy is not sustainable and other elements of the strategic response needs to be amplified,” he said. Ryan added that vaccination efforts should continue and emphasised that “a suppression-only strategy is not a sustainable way to exit the pandemic for any country.” Tedros also said the agency was trying to persuade North Korea and Eritrea to begin vaccinations against the virus. “WHO is deeply concerned at the risk of further spread in (North Korea),” he said, noting the population is unvaccinated and there are worrying numbers of people with underlying conditions that put them at risk of severe disease. Tedros said the WHO has asked North Korea to share more data about the outbreak there but has so far had no response. Pyongyang acknowledged an outbreak for the first time last week, and now says more than 1.7 million people have become ill with fever. North Korea does not have enough testing supplies to confirm large numbers of cases, but outside experts believe most of the fever cases are caused by Covid-19. Tedros said the WHO had offered to send both North Korea and Eritrea vaccines, medicines, tests and technical support, but that neither country’s leader has yet responded. Ryan said any unchecked transmission in countries like North Korea and Eritrea could spur the emergence of new variants, but the WHO was powerless to act unless countries accepted its help.