In Hong Kong 12 people died from swine flu in under a month, released by the health authority.
A spokeswoman for the health authority said one elderly person had died of confirmed swine flu, while another had died of influenza type A, of which swine flue is a sub-type.
An increase in swine flu cases caused densely populated Hong Kong to step up surveillance for the virus on January 24.
"We want to make the public alert to the seriousness" of the situation, she said.
The latest cases come a year-and-a-half after an outbreak of the disease killed 80 people in the city.
The southern Chinese financial centre, home to seven million people, is particularly nervous about infectious diseases following the 2003 SARS outbreak, which killed 300 people in the city and a further 500 worldwide.
Swine flu has killed more than 18,400 people and affected virtually all parts of the world since it was uncovered in Mexico and the United States in April 2009, according to the World Health Organization.
In August, the agency said swine flu had "largely run its course", declaring an end to the pandemic.