“The person is feeling unwell but not currently experiencing any serious symptoms. The individual has no recent travel history,” Goldman Sachs said in an internal email.

That came as disinfection operations were seen being carried out at the Inland Revenue Department’s offices in Revenue Tower in Wan Chai.

The department confirmed late on Thursday that disinfection had been carried out after two employees were hospitalised earlier for potential contact with people who had been infected.

One was the husband of a woman who had recently visited the United States and was confirmed as infected on Thursday. The other employee had been on the same flight from Malaysia to Hong Kong as a passenger who had been infected. Test results on both workers are pending.

Meanwhile, without giving further details, Goldman Sachs said its employee had been in self-isolation at home since Tuesday while receiving further tests. It said it was liaising with the Department of Health to identify colleagues who had been in close contact with the employee.

It said it was closing the 60th and 67th floors in the Cheung Kong Center for disinfection “out of an abundance of caution”.

Everyone from the investment banking division would work from home until further notice, while other staff would be given the option to do the same.

Financial firms including Bank of America and Barclays and regulator the Securities and Futures Commission also have their offices in the 68-storey building in the heart of Hong Kong.

The city had a total of 208 confirmed Covid-19 cases on Thursday.

The Department of Health said a 54-year-old civil servant, who had previously travelled to San Francisco, had tested initially positive for the virus.

Sources said he was a chief town planner in the Planning Department working at the North Point Government Offices. The department confirmed that the infected employee last worked in the North Point office on March 4 and had been on leave since then.