The city reported another 31 cases on Wednesday, bringing the total to 137 in the past week.
Before the recent spike, the Chinese capital had gone 57 days without a locally-transmitted case.
The outbreak is believed to have started in the massive Xinfandi food market that supplies 80% of the city's meat and vegetables.
At least 27 neighbourhoods have been classed as medium risk and one neighbourhood, near the market, is high risk.
People in medium or high-risk areas cannot leave the city. People in low-risk areas can leave, but need to test negative first.
However, getting a test is difficult - three testing stations told the BBC there were no tests available until July. Queues were seen outside other centres.
More than 1,200 flights have been cancelled to and from the city and railway services have been reduced until at least 9 July.
Primary school, middle school, and college classes are suspended, sports teams cannot play, and swimming pools and gyms are closed.
However, roads are open, and companies and factories can still work. The city is on a "level two" alert, the second-highest.