confirmed to have the delta variant. delta is not confirming the reason for those cancellation. let's go to beijing with steven jiang standing by. >> this latest cluster in shenzhen, it's a new variant in guangdong a month ago. the new daily cases relatively low, single digit or low double digits but given this is in china, many officials, especially at the local level, adopt this zero tolerance policy. that's why you've seen them take a familiar page from their playbook you the, mass testing, extensive tracing and lockdown, in the case of shenzhen, because one of the two patients was a restaurant worker at the airport. that's why you've not only seen hundreds of flight cancellations and new rules regarding