Officials in the Chinese capital, Beijing, have highlighted risk of contamination through packaging. In the city which reported 22 new cases on Friday, nucleic acid tests are being carried out on all food and parcel delivery personnel. Officials have been testing people working in catering, including restaurant staff, as well as imported food after virus was found on chopping boards used to handle salmon.
The outbreak, the first in Beijing in months, has now surpassed previous peak numbers in early February. Testing for Covid-19 initially focused on residential areas near the sprawling Xinfadi market and on people who worked or shopped there.