News / Health

Scientists Say New Bird Flu Poses Serious Threat

A child wears a mask near the closed poultry section at the Huhai agricultural market where the H7N9 bird flu was detected by authority in Shanghai, China, Apr. 9, 2013.
A child wears a mask near the closed poultry section at the Huhai agricultural market where the H7N9 bird flu was detected by authority in Shanghai, China, Apr. 9, 2013.
A new strain of bird flu that is causing a deadly outbreak among people in China is a threat to world health and should be taken seriously, scientists said on Wednesday.
The H7N9 strain has killed 24 people and infected more than 125, according to the Geneva-based World Health Organization (WHO), which has described it as "one of the most lethal'' flu viruses.
The high mortality rate, together with relatively large numbers of cases in a short period and the possibility it might acquire the ability to transmit between people, make H7N9 a pandemic risk, experts said.
“The WHO considers this a serious threat,” said John McCauley, director of the WHO Collaborating Center for Influenza at Britain's National Institute for Medical Research.
Speaking at a briefing in London, experts in virology said initial studies suggest the virus has several worrisome characteristics, including two genetic mutations that make it more likely to eventually spread from person to person.
“The longer the virus is unchecked in circulation, the higher the probability that this virus will start transmitting from person to person,” Colin Butte, an expert in avian viruses at Britain's Pirbright Institute, said.
Of the some 125 people infected with H7N9 so far, around 20 percent have died, approximately 20 percent have recovered and the remainder are still sick. The infection can lead to severe pneumonia, blood poisoning and organ failure.
“”This is a very, very serious disease in those who have been infected. So if this were to become more widespread it would be an extraordinarily devastating outbreak,” Peter Openshaw, director of the center for respiratory infection at Imperial College London, told the briefing.
Scientists who have analyzed genetic sequence data from samples from three H7N9 victims say the strain is a so-called “triple reassortant” virus with a mixture of genes from three other flu strains found in birds in Asia.
Recent pandemic viruses, including the H1N1 “swine flu” of 2009/2010, have been mixtures of mammal and bird flu - hybrids that are likely to be milder because mammalian flu tends to make people less severely ill than bird flu.
Pure bird-flu strains, such as the new H7N9 strain and the H5N1 flu, which has killed about 371 of 622 the people it has infected since 2003, are generally more deadly for people.
Human cases of the H7N9 flu have been found in several new parts of China in recent days and have now been recorded in all of its provinces.
Last week a man in Taiwan became the first case of the flu outside mainland China, though he was infected while travelling there. The H7N9 strain was unknown in humans until it was identified in sick people in China in March.
Scientists say it is jumping from birds - most probably chickens - to people, and there is no evidence yet of the virus passing from person to person.
Jeremy Farrar, a leading expert on infectious diseases and director of Oxford University's research unit in Vietnam, said the age range of those infected so far stretched from toddlers to people in their late 80s - a range that appeared to confirm the virus is completely new to the human population.
“That suggests there truly is no immunity across all ages, and that as humans we have not seen this virus before,” he said. “The response has to be calm and measured, but it cannot be taken lightly,” he said.

You May Like

800-Pound Man Determined to Slim Down

Man says he was kicked out of hospital for ordering pizza; wants to be an actor More

Australia Prepares to Resettle 12,000 Syrian Refugees

Preference will be given to refugees from persecuted minorities, and the first group is expected to arrive before late December More

S. African Miners Seek Class Action Suit Against Gold Mines

The estimated 100,000 say say they contracted the lung diseases silicosis and tuberculosis in the mines More

Featured Videos

Your JavaScript is turned off or you have an old version of Adobe's Flash Player. Get the latest Flash player.
Amnesty Accuses Saudi Coalition of ‘War Crimes’ in Yemeni
Henry Ridgwell
October 12, 2015 4:03 PM
The human rights group Amnesty International has accused the Saudi-led coalition of war crimes in airstrikes against Houthi rebels in Yemen. Henry Ridgwell reports the group says hundreds of civilians have been killed in strikes on residential areas.

Video Amnesty Accuses Saudi Coalition of ‘War Crimes’ in Yemen

The human rights group Amnesty International has accused the Saudi-led coalition of war crimes in airstrikes against Houthi rebels in Yemen. Henry Ridgwell reports the group says hundreds of civilians have been killed in strikes on residential areas.

Video No Resolution in Sight to US House Speaker Drama

Uncertainty grips the U.S. Congress, where no consensus replacement has emerged to succeed Republican House Speaker John Boehner after his surprise resignation announcement. Half of Congress is effectively leaderless weeks before America risks defaulting on its national debt and enduring another partial government shutdown.

Video New Art Exhibit Focuses on Hope

Out of struggle and despair often comes hope. That idea is behind a new art exhibit at the American Visionary Art Museum in Baltimore, Maryland. "The Big Hope Show" features 25 artists, some of whom overcame trauma and loss. VOA’s Deborah Block reports.

Video Columbus Day Still Generates Controversy as US Holiday

The second Monday of October is Columbus Day in the United States, honoring explorer Christopher Columbus and his discovery of the Americas. The achievement is a source of pride for many, but for some the holiday is marked by controversy. Adrianna Zhang has more.

Video Anger Simmers as Turks Begin to Bury Blast Victims

The Turkish army carried out new air strikes on Kurdistan Workers Party (PKK) targets on Sunday, a day after the banned group announced a unilateral cease fire. The air raids apparently are in retaliation for the Saturday bombing in Turkey's capital Ankara that killed at least 95 people and wounded more than 200 others. But as Zlatica Hoke reports, there are suspicions that Islamic State is involved.

Video Bombings a Sign of Turkey’s Deep Troubles

Turkey has begun a three-day period of mourning following Saturday’s bomb attacks in the capital, Ankara, that killed nearly 100 people. With contentious parliamentary elections three weeks away, the attacks highlight the challenges Turkey is facing as it struggles with ethnic friction, an ongoing migrant crisis, and growing tensions with Russia. VOA Europe correspondent Luis Ramirez reports.

Video Afghanistan’s Progress Aided by US Academic Center

Recent combat in Afghanistan has shifted world attention back to the central Asian nation’s continuing civil war and economic challenges. But, while there are many vexing problems facing Afghanistan’s government and people, a group of academics in Omaha, Nebraska has kept a strong faith in the nation’s future through programs to improve education. VOA’s Greg Flakus has more from Omaha, Nebraska.

Video House Republicans in Chaos as Speaker Favorite Withdraws

The Republican widely expected to become the next speaker of the House of Representatives shocked his colleagues Thursday by announcing he was withdrawing his candidacy. The decision by Majority Leader Kevin McCarthy means the race to succeed retiring Speaker John Boehner is now wide open. VOA National Correspondent Jim Malone reports.

Video German, US Officials Investigate Volkswagen

German officials have taken steps to restore some of the reputation their car industry has lost after a recent Volkswagen diesel emissions scandal. Authorities have searched Volkswagen headquarters and other locations in an effort to identify the culprits in the creation of software that helps cheat on emission tests. Meanwhile, a group of lawmakers in Washington held a hearing to get to the bottom of the cheating strategy that was first discovered in the United States. Zlatica Hoke reports.

Video Why Are Gun Laws So Hard for Congress to Tackle?

Since taking office, President Barack Obama has spoken out or issued statements about 15 mass shootings. The most recent shooting, in which 10 people were killed at a community college, sparked outrage over the nation's gun laws. But changing those laws isn't as easy as many think. VOA's Carolyn Presutti reports.

Video In 'He Named Me Malala,' Guggenheim Finds Normal in Extraordinary

Davis Guggenheim’s documentary "He Named Me Malala" offers a probing look into the life of 18-year-old Malala Yousafsai, the Pakistani teenager who, in 2012, was shot in the head by the Taliban for standing up for her right to education in her hometown in Pakistan's Swat Valley. Guggenheim shows how, since then, Malala has become a symbol not as a victim of brutal violence, but as an advocate for girls’ education throughout the world. VOA’s Penelope Poulou has more.

Video Paintable Solar Cells May Someday Replace Silicon-Based Panels

Solar panels today are still factory-manufactured, with the use of some highly toxic substances such as cadmium chloride. But a researcher at St. Mary’s College, Maryland, says we are close to being able to create solar panels by painting them on a suitable surface, using nontoxic solutions. VOA’s George Putic reports.

VOA Blogs