There has also been occasional human-to-human transmission, according to the World Health Organization.
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There is no sign that the virus is being transmitted from human to human.
"We continue to see human-to-human transmission, community transmission, primarily in North America, " said WHO Assistant Director-General Keiji Fukuda.
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Although both jumped the "animal-to-human" barrier, neither disease mutated enough to enable sustained human-to-human infection, said Dr. K.Y.
There may also be evidence of human to human spread of the virus.
His conclusion, published in the September Emerging Infectious Diseases: It's highly likely there was a transmission from human to human.
"For a sustained pandemic, it needs to be able to maintain human-to-human contact without killing its host off, " he said.
While this is a new strain of bird flu, WHO said there has been no evidence of human to human transmission.
When the avian flu first surfaced in 1997, the big unknown was whether the virus could be transmitted from human to human.
Soon, machine-to-machine conversations will outnumber human-to-human and human-to-machine conversations many times over.
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For the moment, experts say the risk of a mass outbreak remains limited, given that the virus isn't easily spread from human to human.
Two, those aspects of a transaction subject to human reason are not subject to any human reason, but to the reason of a Shariah authority.
Sometimes these include the ability to jump from human to human.
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But in the current issue of The New England Journal of Medicine, Thai doctors report two cases of apparent human-to human transmission of the bird flu.
But these human to human connections seem to be losing some of their currency in an era where so much of our social networking has moved online.
The last recorded case of human to human transmission came in October 1977 when a cook called Ali Maow Maalin, living in a Somali village, contracted the illness.
We have yet to see human-to-human transmission of the virus.
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Now a new computer simulation confirms what some long suspected: The H5N1 virus already has spread from human to human--or at least it did in one case cluster last year in Indonesia.
Then, as the new virus replicates it mutates further and, if luck is on its side, some of these mutations allow it to spread from human to human - a new influenza pandemic is born.
"We ask for forgiveness that for nearly 50 years we didn't find a way of reaching out to you from human being to human being, " he said at a ceremony in the western German city of Stolberg, where the firm is based.
It is also not yet known how all the infections occurred, with the WHO unable to confirm any cases of human-to-human transmission.
An increasing focus among public health officials and the media is the prospect that transmission of the disease is not only animal-to-animal but also human-to-human.
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To better understand the virus's spread and potential for human-to-human transmission, Chinese and World Health Organization officials said Wednesday in Beijing that they plan to boost surveillance and research on H7N9.
Dr Ward and Dr Kellis found that, in addition to the 5% of human DNA that is conserved between mammals, an additional 4% of human DNA appears to be uniquely human in the sense that it is prone to purifying selection in humans but not in other mammals.
Chinese and World Health Organization officials said Wednesday in Beijing that they plan to boost surveillance and research on the H7N9 virus to understand its spread and potential for human-to-human transmission.
The only way to comprehend it is in terms of a human struggle to keep technology human, given its natural tendency to evolve in disturbing and incomprehensible-to-humans way.
However, it warns that two clusters in Saudi Arabia and Jordan, "raise the possibility of limited human-to-human transmission" or they could have been exposed to the same source of the infection.
Officials are reminding the public to remain calm and say there is still no evidence of human-to-human transmission or links with recent discoveries of dead pigs, the newspaper adds.
Since neither of the two children, a 10-year-old boy and a 9-year-old girl, had contact with pigs, it "increases the possibility that human-to-human transmission of this new influenza virus has occurred, " according to a CDC report.
Even so, says the WHO, it would take at least four months to create and start mass-producing a vaccine against a new, human-to-human version.
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