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Really it's a new mystery tonight over the bird flu the World Health Organization says number of people who have tested positive in China appeared you.
Have had no contact with birds.
Here in the US experts are holding their collective breath senior national correspondent John Roberts has the latest from Atlanta.
The CDC's emergency operations center at the second highest level of alert watching for the first signs this new bird flu has become broadly contagious.
What they do -- it has mutations that can make it more likely to infect humans.
This virus has the potential if it developed person to person spread capacity.
To cause severe pandemic -- In China where the virus was first identified in late march 82 people have fallen ill seventeen of them died that's one in five.
The disease progression is horrible pneumonia septic shock kidney failure.
The good news tests it CDC labs -- sensitive to front line anti viral Tamiflu and -- caught and treated early patients can recover.
That's a relief in one respect because you know the drugs work about it so a concern another respect because it indicates -- still.
A lot we don't know about this virus.
The race is on to develop a vaccine but vaccines for similar strains have had problems it may take two shots or the addition of other drugs to provoke immune response.
The need for protection is urgent.
I do have.
Greater level of concern about this fire -- -- in some other viruses that we've seen in the past.
There may have already been limited human to human transmission.
Chinese authorities say 40% of bird flu patients had no direct contact with poultry.
They also found a four year old boy in Beijing who tested positive for the virus but wasn't sick.
Well that is a positive sign it also means scientists may have no idea how many people have been infected.
So far no evidence that the virus is made its way to United States yet.
John thank you.
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