"At the boundary checkpoints - both the airlines and the express train - there will be increased surveillance on fever using different machines", Sophia Chan Siu-chee, the Secretary for Food and Health, said after several Hong Kong government bureaus held an inter-departmental meeting to discuss the pneumonia-like cases in Wuhan.
The Wuhan city health commission said those listed as critical are being kept in isolation, and that an additional 121 people who came into contact with those patients are under observation.
The outbreak prompted authorities in Hong Kong, Macao, Taiwan, South Korea, Singapore and Malaysia to take emergency measures, including stricter health control at borders and temperature screenings on all flights from Wuhan, in China's central Hubei Province, where the outbreak originated.
As China has the technology to identify viruses within 48 hours, the authority's slow response has led many to be suspicious as to why the disease has yet to be identified.
Seven patients are critically ill, 18 others are in stable condition, and two are recovering and are expected to be released shortly, according to the Wuhan health department.
Tony Ko Pat-sing, chief executive of the Hospital Authority, said three people were admitted to Princess Margaret Hospital, Tuen Mun Hospital and Alice Ho Miu Ling Nethersole Hospital as suspected cases, but their fevers had already gone, and two were sent home.
Initial laboratory tests found no "apparent human-to-human transmission" and so far no medical staff had been infected, the statement said.
Yuen Kwok-yung, a microbiologist at the University of Hong Kong, told local media on Wednesday that the viral infection in Wuhan appeared similar to the 1997 outbreak of bird flu and the SARS epidemic in China. However, a number of those infected worked at a seafood market in the city, leading authorities to clean the area.
The government emphasized that Hong Kong had not received any Wuhan-related severe pneumonia cases.
"Since we are now in the holiday season, and Hong Kong has close transport ties with Wuhan, we must stay alert".
In 2003, Chinese officials covered up a SARS outbreak for weeks before a growing death toll and rumors forced the government to reveal the epidemic, apologize and vow full candor in future outbreaks.
The organisation said hospitals across the city have treated a "successive series of patients with unexplained pneumonia".
Taiwan's Centers for Disease Control (CDC) organized a press conference on the afternoon of December 31.
Since 2004, there have not been any known cases of SARS reported anywhere in the world, the NHS says.
SARS, which emerged in southern China in late 2002, spread rapidly from south China to other cities and countries in 2003.