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.
A signaling system malfunction disrupted high-speed rail (HSR) services beginning at 8am today, with trains temporarily reduced to three northbound and three southbound trains per hour as authorities conduct inspections. The malfunction occurred on a section of track in Miaoli County during pre-operation checks early this morning, forcing northbound and southbound trains to use a single track, the HSR operator said. The regular schedule has been replaced with three hourly trains offering only nonreserved seating in each direction, stopping at every station, it said, adding that business class cars would still have reserved seating. Departures from terminal stations are scheduled at the top
Taiwan is still in the process of assessing the possibility of recruiting workers from Eswatini, the Ministry of Foreign Affairs said yesterday, adding that its goal is to help Eswatini upgrade its vocational training centers. If there are plans to recruit workers from Eswatini, safeguarding national security, protecting public health and ensuring the employment rights of Taiwanese would be prerequisites, Department of West Asian and African Affairs Director-General Yen Chia-liang (顏嘉良) told a news conference. Key considerations would also include filling labor shortages in specific industries, and fostering bilateral professional and technical exchanges, he said. Yen was asked about the progress of labor
A US uncrewed surface vessel (USV) encountered multiple Chinese warships during an autonomous transit of the Taiwan Strait, US defense company Seasats said in a statement on Wednesday. Seasats announced that a Lightfish USV had completed the first autonomous transit of the Taiwan Strait. Over five days, the USV traversed the entire length of the Strait while constantly monitoring surface vessel traffic, the company said. The Lightfish encountered multiple Chinese warships, one of which was a Chinese People’s Liberation Army Navy (PLAN) Type 056 corvette, it said. The Chinese vessels were operating “well within Taiwan’s exclusive economic zone without transmitting their identity via the
VERBOSE VESSELS: A CGA cutter and a China Coast Guard exchanged verbal barbs for more than a day in Taiwanese-controlled waters before the Chinese vessel left The Taiwanese and Chinese coast guards had a standoff near the strategically located Pratas Islands (Dongsha Islands, 東沙群島) in the north of the South China Sea, the Coast Guard Administration (CGA) said yesterday. The two sides engaged in intense radio exchanges over sovereignty claims during the 33-hour standoff. China Coast Guard vessel 3501 eventually left the restricted waters, 26.6 nautical miles (49.2km) west of the Pratas Islands, at 5pm yesterday, the CGA said. Lying approximately between southern Taiwan and Hong Kong, the Taiwan-controlled Pratas are seen by some security experts as vulnerable to Chinese attack due to their distance — more than
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