Tianjin reported 33 domestically transmitted coronavirus infections with confirmed symptoms yesterday, up from 10 a day earlier, national data showed.

The city ordered a half-day off for employees at companies and other institutions today and required them to remain at home to comply with the city’s second round of mass testing, the local government said in a statement.

In the central city of Anyang, where Omicron has also been detected in the community, local symptomatic cases number surged to 65 yesterday from just two a day earlier.

The case loads in Tianjin and Anyang are small compared with many outbreaks outside China, with the total number of Omicron infections unclear.

The two cities have restricted residents’ movement within the cities and made it harder for people to leave town as mass testing campaigns are ongoing.

The country is likely to see a higher average level of virus restrictions to contain the highly transmissible Omicron, Goldman Sachs analysts said in a note, revising down their 2022 growth forecast for China to 4.3% from 4.8% previously, citing economic costs from the potentially intensified measures.

Analysts at Morgan Stanley also said they saw downside risk to their forecast of growth in the first quarter this year, as Omicron could “imply more costs than benefits under China’s Covid-zero strategy”.

China’s policy of extinguishing clusters quickly has taken on extra urgency in the run-up to the Winter Olympics, to be staged in Beijing and neighbouring Hebei province starting Feb 4, and with the Lunar New Year holiday travel season beginning later this month.

Including infections in Tianjin and Anyang, mainland China reported a total of 166 local symptomatic cases yesterday, more than 110 a day earlier.

There were no new deaths, leaving the death toll at 4,636.

As of Jan 11, mainland China had 104,189 confirmed symptomatic cases, including both local ones and those arriving from overseas.