Some strains of bird flu are coming ever closer to developing the traits they need to cause a human pandemic, a study released yesterday said. Researchers who analyzed samples of recent avian flu viruses found that a few H7 strains of the virus that have caused minor, untransmissible infections in people in North America between 2002 and 2004 have increased their affinity for the sugars found on human tracheal cells.
Subsequent tests in ferrets suggested that these viral strains were not readily transmissible. But one strain of the H7N2 virus, a low pathogenic avian flu strain isolated from a man in New York in 2003, replicated in the ferret’s respiratory tract and was passed between infected and uninfected ferrets suggesting it could be transmissible in humans.
The investigators said the evidence suggests that the virus could be evolving toward the same strong sugar-binding properties of the three worldwide viral pandemics in 1918, 1957 and 1968.
“These findings suggest that the H7 class of viruses are partially adapted to recognize the receptors that are preferred by the human influenza virus,” said Terrence Tumpey, a senior microbiologist with the US Centers for Disease Control and Prevention in Atlanta, Georgia.
The authors said that if the viruses continue to evolve in this direction, the avian flu viruses could travel more easily between other animals and humans.
They called for strict surveillance of avian flu viruses and continuing federal preparations for a possible future pandemic.
The study appears in the Proceedings of the National Academy of Sciences.
People can preregister to receive their NT$10,000 (US$325) cash distributed from the central government on Nov. 5 after President William Lai (賴清德) yesterday signed the Special Budget for Strengthening Economic, Social and National Security Resilience, the Executive Yuan told a news conference last night. The special budget, passed by the Legislative Yuan on Friday last week with a cash handout budget of NT$236 billion, was officially submitted to the Executive Yuan and the Presidential Office yesterday afternoon. People can register through the official Web site at https://10000.gov.tw to have the funds deposited into their bank accounts, withdraw the funds at automated teller
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