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New bird flu strain: 5 things to know

Chickens line the walls at a poultry farm on Thursday, April 18, in Yuncheng, China.

The H7N9 strain responsible for the bird flu outbreak in China is unlike any that has previously been seen in this type of virus.

So far, 110 cases have been reported, including one in Taiwan, and 23 people have died. Here are some things to know about this virus:

No evidence of human-to-human transmission to date

So far, authorities said, there is no evidence that this virus can pass from person to person. That doesn't mean it can't happen later.

"If limited person-to-person transmission is demonstrated in the future, this really will not be surprising," Keiji Fukuda, the World Health Organization's assistant director-general for health, security and the environment, told a news conference Wednesday in Beijing

A 7-year-old girl, who was the first confirmed bird flu case in Beijing, is discharged from Beijing Ditan Hospital on Wednesday, April 17.

It's dangerous and deadly to humans

The virus appears to be transmitted more easily from poultry to humans than H5N1, Fukuda said, referring to the strain responsible for the outbreak between 2004 and 2007, which claimed 332 lives.

"This is definitely one of the most lethal influenza viruses that we have seen so far," he said.

The H7N9 strain was never known to infect people until March. Before then, it was only found in birds.

If the virus does start to spread easily between people, it could trigger a pandemic.

"This is a serious public health situation and it's possible that a pandemic could start if this virus were to change to spread easily between people," the U.S. Centers for Disease Control and Prevention said on its website. "CDC is preparing for that possibility."

New bird flu well-adapted to infect people

There's still a lot of unknowns

It's not clear why this virus strain is infecting humans now, and the source of the infection is unknown.

Scientists have analyzed the genes of the H7N9 viruses and found that they show signs indicating they can adapt to grow in mammals. It appears they can bind to mammalian cells and grow at temperatures near mammals' normal body temperatures, which is lower than that of birds, WHO said.

There is no vaccine available, but WHO said efforts are underway in other countries after Chinese officials said international help would be needed. The CDC said researchers there are working on a vaccine candidate virus.

Pedestrians in Shanghai wear face masks to protect themselves from the H7N9 bird flu virus on Tuesday, April 16.

Cooking poultry can kill the virus before you eat it

In normal cooking temperatures -- so all parts of the meat reach at least 158 degrees Fahrenheit (70 degrees Celsius) with no "pink" -- the virus would be inactivated, including in poultry and game birds.

Generally, eating raw meat is discouraged anyway, as doing so can lead to a variety of foodborne illnesses.

You should not, however, eat diseased animals or animals known to have died from diseases.

No travel restrictions; low U.S. risk

The CDC is not advising against traveling to China, but travelers who go there should refrain from touching birds and other animals and wash their hands often.

There is currently no incidence of the virus in the United States, but the most likely scenario for it to get there would be through a person traveling from China.

The risk to persons in the United States is low, the CDC said.

There are no tests available at pharmacies or doctors' offices to distinguish this flu quickly from any other flu virus, the CDC said. However, there is a sophisticated test to detect the H7N9 virus in particular, which takes at least four hours.

"Anyone with fever, coughing or shortness of breath within 10 days of traveling to China should see a doctor and tell the doctor about the recent travel to China," the CDC said on its website.

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