There has also been occasional human-to-human transmission, according to the World Health Organization.
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But the WHO says there is currently no evidence of human-to-human transmission of the virus.
The World Health Organisation (WHO) said there was no evidence yet of human-to-human transmission.
"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.
In a statement, the WHO reiterated that there was not yet any evidence of human-to-human transmission of the virus.
So far, the WHO said, there is no evidence of ongoing human-to-human transmission.
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Previous cases of human-to-human transmission may have occurred in Hong Kong, Vietnam and Thailand, as well as in Indonesia.
"For a sustained pandemic, it needs to be able to maintain human-to-human contact without killing its host off, " he said.
Authorities have yet to find any connection between the cases and say there is so far no evidence of human-to-human transmission.
This comes after the French health ministry confirmed a second man had contracted the virus in a possible case of human-to-human transmission.
It is also not yet known how all the infections occurred, with the WHO unable to confirm any cases of human-to-human transmission.
Soon, machine-to-machine conversations will outnumber human-to-human and human-to-machine conversations many times over.
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It is not yet known how people are catching the disease, although the WHO says there is currently no evidence of human-to-human transmission.
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.
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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Health authorities are testing a family infected by H7N9 in Shanghai for human-to-human transmission of the new bird flu strain, The Beijing News reports.
Trite but true, in business markets, human-to-human (HtoH) experiences are extremely important as many business transactions and interactions involve some sort of direct HtoH contact.
But the WHO says there is no evidence of human-to-human transmission.
The WHO said investigations were being conducted into the likely source of the infection, the method of exposure, and the possibility of human-to-human transmission of the virus.
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We have yet to see human-to-human transmission of the virus.
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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.
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.
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.
Turning to China's bird flu outbreak, the government says there is still no evidence of human-to-human transmission of the H7N9 virus but does not rule out a further spread of outbreaks.
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.
"There are a few cases where no pig exposure could be found, so we think those are are human-to-human transmissions, " said Dr. Joseph Bresee, an epidemiologist in the CDC's Influenza Division.
The move means the U.N. agency has determined that the virus is capable of significant human-to-human transmission -- a major step toward a pandemic, but not necessarily inevitable, Dr. Keiji Fukuda said.
The 1918 pandemic did its worst after the first human death between week 16 and week 26 after the second wave and where the virus had mutated into the deadly human-to-human mass killer.
But we have analysed the potential killer virus against the history of the 2009 Swine Flu and where a drugs cure for a future avian human-to-human killer virus will come far too late.
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