Two more people have died of bird flu in Asia, as experts warned the virus was far from being under control.
An 18-year-old man in Vietnam and a 58-year-old Thai woman took the total death toll to 12.
People who have contracted H5N1 bird flu are thought to have caught it through contact with sick birds.
The World Health Organization (WHO) has said it cannot rule out one case of human to human transmission in Vietnam, but there was no firm evidence of it.
The case involves two sisters who died after having contact with their brother. The man died after appearing to contract bird flu, although he was cremated before tests were done.
The WHO said it had not been able to conclusively identify the source of infection for the two sisters, and that their brother was therefore one possible explanation.
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