Read more: Employees locked inside office tower after single Omicron case in BeijingThe agency claimed that a comprehensive investigation, sampling and testing of the mailed papers showed traces of the Omicron variant. Story continues below advertisementThe person who tested positive had not travelled internationally or domestically 14 days prior to being infected, it said. It urged residents to minimize the purchase of overseas goods and to wear masks and disposable gloves when receiving international mail. However, the total number Omicron cases across China remains unclear. But current evidence suggests that the virus is predominantly transmitted from person to person via respiratory droplets, WHO says on its website.

Source: CBC News January 18, 2022 10:57 UTC