WHO spokesperson Gregory Hartl says human infections continue to rise at a rate of two or three cases confirmed one day, but the cases are still sporadic. The spokesperson made the comments while speaking to journalists at a briefing in Geneva on Tuesday.

Gregory Hartl, spokesperson of World Health Organization, said:"There is no evidence of sustained human-to-human transmission. There are some suspected but not yet confirmed cases of perhaps very limited transmission between close family members. As I just said, those are still being investigated."

The World Health Organization says China is still investigating cases of the new H7N9 flu and is starting to test for the new strain across the country. So far, the H7N9 strain has been found in pigeons, quails and chickens. The exact source of the infection remains unknown. Hartl stressed the importance of making sure poultry meat was properly cooked before consumption and of maintaining strict hygiene standards to prevent infection.

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