简体中文
The World Health Organization announced on Tuesday that no samples of the H7N9 bird flu virus has been found in pigs in China, so far.
It also said at this point, there's no evidence of human to human transmission.
A WHO spokesman said animal samples that tested positive for the virus came from poultry markets, including live birds.
And so the focus at this point, remains on poultry.
But the spokesman also said it's not sure what the source of infection is.
SOUNDBITE (ENGLISH) GREGORY HARTL, WHO spokesman:
"For the moment, we do not have 100 percent surety on what the source of infection is. As I said, there's a lot of focus at the moment on poultry market, but that might not be the correct source or the only source."
The spokesman added that those who had been in contact with patients suffering from the deadly disease had been closely monitored, with none testing positive for H7N9...
But that infection 'clusters' have been found...
One of the suspected family clusters was in Shanghai, with three family members having similar symptoms and one of them being confirmed of H7N9.
The patient died, along with another family member suspected of being infected with the virus.
Another suspected 'cluster' includes two family members showing flu symptoms - one of whom was confirmed as suffering from H7N9 - in Jiangsu Province.
But the spokesman said further investigations are still needed to know whether this was a human-to-human transmission:
SOUNDBITE (ENGLISH) GREGORY HARTL, WHO spokesman:
"If it (the infection of H7N9) is confirmed in the other family member, it has not been confirmed yet, if it is confirmed, it means that it passed between two people under the same roof, and if it passes between two people under the same roof, it's either a human-to-human transmission between two people have constant and close contact or it could be virus from the same environmental source."
