"We've been saying this for weeks that this highly infectious virus was always going to be very hard to stop completely, with just public health and social measures."
Speaking during a weekly news conference in Geneva WHO chief Tedros Adhanom Ghebreyesus said he is "very concerned over the evolving situation in China".คาสิโนบาคาร่า
He appealed for specific data on disease severity, hospital admissions and intensive care requirements.
Dr Ryan added that "vaccination is the exit strategy" to coronavirus outbreaks.
China has developed and produced its own vaccines, which have been shown to be less effective at protecting people against serious Covid illness and death than the mRNA vaccines used in much of the rest of the world.
His comments come as the German government announced on Wednesday it had sent its first batch of BioNTech Covid-19 vaccines to China.